Immich Folder Album Creator

This is a python script designed to automatically create albums in Immich from a folder structure mounted into the Immich container. This is useful for automatically creating and populating albums for external libraries. Using the provided docker image, the script can simply be added to the Immich compose stack and run along the rest of Immich's containers.

Current compatibility: Immich v1.106.1 - v1.114.x

Disclaimer

This script is mostly based on the following original script: REDVM/immich_auto_album.py

Table of Contents

1. Usage (Bare Python Script)
2. Usage (Docker)
3. Choosing the correct root_path
4. How It Works (with Examples)
5. Filtering
6. Automatic Album Sharing
7. Cleaning Up Albums
8. Assets in Multiple Albums
9. Dealing with External Library Changes

Usage

Bare Python Script

1. Download the script and its requirements

   curl https://raw.githubusercontent.com/Salvoxia/immich-folder-album-creator/main/immich_auto_album.py -o immich_auto_album.py
   curl https://raw.githubusercontent.com/Salvoxia/immich-folder-album-creator/main/requirements.txt -o requirements.txt
   

2. Install requirements

   pip3 install -r requirements.txt
   

3. Run the script

   usage: immich_auto_album.py [-h] [-r ROOT_PATH] [-u] [-a ALBUM_LEVELS] [-s ALBUM_SEPARATOR] [-c CHUNK_SIZE] [-C FETCH_CHUNK_SIZE] [-l {CRITICAL,ERROR,WARNING,INFO,DEBUG}] [-k] [-i IGNORE] [-m {CREATE,CLEANUP,DELETE_ALL}] [-d]
                           [-x SHARE_WITH] [-o {viewer,editor}] [-S {0,1,2}] [-O {False,asc,desc}] [-A] [-f PATH_FILTER]
                           root_path api_url api_key
   
   Create Immich Albums from an external library path based on the top level folders
   
   positional arguments:
     root_path             The external libarary's root path in Immich
     api_url               The root API URL of immich, e.g. https://immich.mydomain.com/api/
     api_key               The Immich API Key to use
   
   options:
     -h, --help            show this help message and exit
     -r ROOT_PATH, --root-path ROOT_PATH
                           Additional external libarary root path in Immich; May be specified multiple times for multiple import paths or external libraries. (default: None)
     -u, --unattended      Do not ask for user confirmation after identifying albums. Set this flag to run script as a cronjob. (default: False)
     -a ALBUM_LEVELS, --album-levels ALBUM_LEVELS
                           Number of sub-folders or range of sub-folder levels below the root path used for album name creation. Positive numbers start from top of the folder structure, negative numbers from the bottom. Cannot be
                           0. If a range should be set, the start level and end level must be separated by a comma like '<startLevel>,<endLevel>'. If negative levels are used in a range, <startLevel> must be less than or equal to
                           <endLevel>. (default: 1)
     -s ALBUM_SEPARATOR, --album-separator ALBUM_SEPARATOR
                           Separator string to use for compound album names created from nested folders. Only effective if -a is set to a value > 1 (default: )
     -c CHUNK_SIZE, --chunk-size CHUNK_SIZE
                           Maximum number of assets to add to an album with a single API call (default: 2000)
     -C FETCH_CHUNK_SIZE, --fetch-chunk-size FETCH_CHUNK_SIZE
                           Maximum number of assets to fetch with a single API call (default: 5000)
     -l {CRITICAL,ERROR,WARNING,INFO,DEBUG}, --log-level {CRITICAL,ERROR,WARNING,INFO,DEBUG}
                           Log level to use (default: INFO)
     -k, --insecure        Set to true to ignore SSL verification (default: False)
     -i IGNORE, --ignore IGNORE
                           A string containing a list of folders, sub-folder sequences or file names separated by ':' that will be ignored. (default: )
     -m {CREATE,CLEANUP,DELETE_ALL}, --mode {CREATE,CLEANUP,DELETE_ALL}
                           Mode for the script to run with. CREATE = Create albums based on folder names and provided arguments; CLEANUP = Create album nmaes based on current images and script arguments, but delete albums if they
                           exist; DELETE_ALL = Delete all albums. If the mode is anything but CREATE, --unattended does not have any effect. Only performs deletion if -d/--delete-confirm option is set, otherwise only performs a
                           dry-run. (default: CREATE)
     -d, --delete-confirm  Confirm deletion of albums when running in mode CLEANUP or DELETE_ALL. If this flag is not set, these modes will perform a dry run only. Has no effect in mode CREATE (default: False)
     -x SHARE_WITH, --share-with SHARE_WITH
                           A user name (or email address of an existing user) to share newly created albums with. Sharing only happens if the album was actually created, not if new assets were added to an existing album. If the
                           the share role should be specified by user, the format <userName>=<shareRole> must be used, where <shareRole> must be one of 'viewer' or 'editor'. May be specified multiple times to share albums with
                           more than one user. (default: None)
     -o {viewer,editor}, --share-role {viewer,editor}
                           The default share role for users newly created albums are shared with. Only effective if --share-with is specified at least once and the share role is not specified within --share-with. (default:
                           viewer)
     -S {0,1,2}, --sync-mode {0,1,2}
                           Synchronization mode to use. Synchronization mode helps synchronizing changes in external libraries structures to Immich after albums have already been created. Possible Modes: 0 = do nothing; 1 =
                           Delete any empty albums; 2 = Trigger offline asset removal (REQUIRES API KEY OF AN ADMIN USER!) (default: 0)
     -O {False,asc,desc}, --album-order {False,asc,desc}
                           Set sorting order for newly created albums to newest or oldest file first, Immich defaults to newest file first (default: False)
     -A, --find-assets-in-albums
                           By default, the script only finds assets that are not assigned to any album yet. Set this option to make the script discover assets that are already part of an album and handle them as usual. (default:
                           False)
     -f PATH_FILTER, --path-filter PATH_FILTER
                           Use glob-like patterns to filter assets before album name creation. This filter is evaluated before any values passed with --ignore. (default: )
   

Plain example without optional arguments:

python3 ./immich_auto_album.py /path/to/external/lib https://immich.mydomain.com/api thisIsMyApiKeyCopiedFromImmichWebGui

Docker

A Docker image is provided to be used as a runtime environment. It can be used to either run the script manually, or via cronjob by providing a crontab expression to the container. The container can then be added to the Immich compose stack directly.

Environment Variables

The environment variables are analoguous to the script's command line arguments.

Environment varible	Mandatory?	Description
ROOT_PATH	yes	A single or a comma separated list of import paths for external libraries in Immich. Refer to Choosing the correct root_path.
API_URL	yes	The root API URL of immich, e.g. https://immich.mydomain.com/api/
API_KEY	yes	The Immich API Key to use
CRON_EXPRESSION	yes	A crontab-style expression (e.g. 0 * * * *) to perform album creation on a schedule (e.g. every hour).
ALBUM_LEVELS	no	Number of sub-folders or range of sub-folder levels below the root path used for album name creation. Positive numbers start from top of the folder structure, negative numbers from the bottom. Cannot be 0. If a range should be set, the start level and end level must be separated by a comma. Refer to How it works for a detailed explanation and examples.
ALBUM_SEPARATOR	no	Separator string to use for compound album names created from nested folders. Only effective if -a is set to a value > 1(default: " ")
CHUNK_SIZE	no	Maximum number of assets to add to an album with a single API call (default: 2000)
FETCH_CHUNK_SIZE	no	Maximum number of assets to fetch with a single API call (default: 5000)
LOG_LEVEL	no	Log level to use (default: INFO), allowed values: CRITICAL,ERROR,WARNING,INFO,DEBUG
INSECURE	no	Set to true to disable SSL verification for the Immich API server, useful for self-signed certificates (default: false), allowed values: true, false
IGNORE	no	A string containing a list of folders, sub-folder sequences or file names separated by ':' that will be ignored.
MODE	no	Mode for the script to run with. CREATE = Create albums based on folder names and provided arguments CLEANUP = Create album nmaes based on current images and script arguments, but delete albums if they exist DELETE_ALL = Delete all albums. If the mode is anything but CREATE, --unattended does not have any effect. (default: CREATE). Refer to Cleaning Up Albums.
DELETE_CONFIRM	no	Confirm deletion of albums when running in mode CLEANUP or DELETE_ALL. If this flag is not set, these modes will perform a dry run only. Has no effect in mode CREATE (default: False). Refer to Cleaning Up Albums.
SHARE_WITH	no	A single or a colon (:) separated list of existing user names (or email addresses of existing users) to share newly created albums with. If the the share role should be specified by user, the format = must be used, where must be one of viewer or editor. May be specified multiple times to share albums with more than one user. (default: None) Sharing only happens if an album is actually created, not if new assets are added to it. Refer to Automatic Album Sharing.
SHARE_ROLE	no	The role for users newly created albums are shared with. Only effective if SHARE_WITH is not empty and no explicit share role was specified for at least one user. (default: viewer), allowed values: viewer, editor
SYNC_MODE	no	Synchronization mode to use. Synchronization mode helps synchronizing changes in external libraries structures to Immich after albums have already been created. Possible Modes: 0 = do nothing 1 = Delete any empty albums 2 = Trigger offline asset removal (REQUIRES API KEY OF AN ADMIN USER!) (default: 0) Refer to Dealing with External Library Changes.
ALBUM_ORDER	no	Set sorting order for newly created albums to newest (desc) or oldest (asc) file first, Immich defaults to newest file first, allowed values: asc, desc
FIND_ASSETS_IN_ALBUMS	no	By default, the script only finds assets that are not assigned to any album yet. Set this option to make the script discover assets that are already part of an album and handle them as usual. (default: False) Refer to Assets in Multiple Albums.
PATH_FILTER	no	Use glob-like patterns to filter assets before album name creation. This filter is evaluated before any values passed with --ignore. (default: ``) Refer to Filtering.

Run the container with Docker

To perform a manually triggered dry run (only list albums that would be created), use the following command:

docker run -e API_URL="https://immich.mydomain.com/api/" -e API_KEY="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" -e ROOT_PATH="/external_libs/photos" salvoxia/immich-folder-album-creator:latest /script/immich_auto_album.sh

To actually create albums after performing a dry run, use the following command (setting the UNATTENDED environment variable):

docker run -e UNATTENDED="1" -e API_URL="https://immich.mydomain.com/api/" -e API_KEY="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" -e ROOT_PATH="/external_libs/photos" salvoxia/immich-folder-album-creator:latest /script/immich_auto_album.sh

To set up the container to periodically run the script, give it a name, pass the TZ variable and a valid crontab expression as environment variable. This example runs the script every hour:

docker run --name immich-folder-album-creator -e TZ="Europe/Berlin" -e CRON_EXPRESSION="0 * * * *" -e API_URL="https://immich.mydomain.com/api/" -e API_KEY="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" -e ROOT_PATH="/external_libs/photos" salvoxia/immich-folder-album-creator:latest

If your external library uses multiple import paths or you have set up multiple external libraries, you can pass multiple paths in ROOT_PATH by setting it to a comma separated list of paths:

docker run --name immich-folder-album-creator -e TZ="Europe/Berlin" -e CRON_EXPRESSION="0 * * * *" -e API_URL="https://immich.mydomain.com/api/" -e API_KEY="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" -e ROOT_PATH="/external_libs/photos,/external_libs/more_photos" salvoxia/immich-folder-album-creator:latest

Run the container with Docker-Compose

Adding the container to Immich's docker-compose.yml file:

#
# WARNING: Make sure to use the docker-compose.yml of the current release:
#
# https://github.com/immich-app/immich/releases/latest/download/docker-compose.yml
#
# The compose file on main may not be compatible with the latest release.
#

name: immich

services:
  immich-server:
    container_name: immich_server
    volumes:
     - /path/to/my/photos:/external_libs/photos
  ...
  immich-folder-album-creator:
    container_name: immich_folder_album_creator
    image: salvoxia/immich-folder-album-creator:latest
    restart: unless-stopped
    environment:
      API_URL: http://immich_server:3001/api
      API_KEY: xxxxxxxxxxxxxxxxx
      ROOT_PATH: /external_libs/photos
      CRON_EXPRESSION: "0 * * * *"
      TZ: Europe/Berlin

Choosing the correct root_path

The root path /path/to/external/lib/ is the path you have mounted your external library into the Immich container.
If you are following Immich's External library Documentation, you are using an environment variable called ${EXTERNAL_PATH} which is mounted to /usr/src/app/external in the Immich container. Your root_path to pass to the script is /usr/src/app/external.

How it works

The script utilizies Immich's REST API to query all images indexed by Immich, extract the folder for all images that are in the top level of any provided root_path, then creates albums with the names of these folders (if not yet exists) and adds the images to the correct albums.

The following arguments influence what albums are created:
root_path, --album-levels and --album-separator

• root_path is the base path where images are looked for. Multiple root paths can be specified by adding the -r argument as many times as necessary. Only images within that base path will be considered for album creation.
• --album-levels controls how many levels of nested folders are considered when creating albums. The default is 1. For examples see below.
• --album-separator sets the separator used for concatenating nested folder names to create an album name. It is a blank by default.

Examples:
Suppose you provide an external library to Immich under the path /external_libs/photos. The folder structure of photos might look like this:

/external_libs/photos/
├── 2020/
│   ├── 02 Feb/
│   │   └── Vacation/
│   ├── 08 Aug/
│   │   └── Vacation/
├── Birthdays/
│   ├── John/
│   └── Jane/
└── Skiing 2023/

Albums created for root_path = /external_libs/photos (--album-levels is implicitly set to 1):

• 2020 (containing all images from 2020 and all sub-folders)
• Birthdays (containing all images from Birthdays itself as well as John and Jane)
• Skiing 2023

Albums created for root_path = /external_libs/photos (--album-levels is implicitly set to 1) and --ignore "Vacation":

• 2020 (containing all images from 2020, 2020/02 Feb and 2020/08 Aug, but NOT 2020/02 Feb/Vacation or 2020/08 Aug/Vacation)
• Birthdays (containing all images from Birthdays itself as well as John and Jane)
• Skiing 2023

Albums created for root_path = /external_libs/photos/Birthdays:

• John
• Jane

Albums created for root_path = /external_libs/photos and --album-levels = 2:

• 2020 (containing all images from 2020 itself, if any)
• 2020 02 Feb (containing all images from 2020/02 Feb itself, 2020/02 Feb/Vacation and 2020/02 Aug/Vacation)
• Birthdays John (containing all imags from Birthdays/John)
• Birthdays Jane (containing all imags from Birthdays/John)
• Skiing 2023

Albums created for root_path = /external_libs/photos, --album-levels = 3 and --album-separator " - " :

• 2020 (containing all images from 2020 itself, if any)
• 2020 - 02 Feb (containing all images from 02 Feb itself, if any)
• 2020 - 02 Feb - Vacation (containing all imags from 2020/02 Feb/Vacation)
• 2020 - 08 Aug - Vacation (containing all imags from 2020/02 Aug/Vacation)
• Birthdays - John
• Birthdays - Jane
• Skiing 2023

Albums created for root_path = /external_libs/photos, --album-levels = -1 and --album-separator " - " :

• 2020 (containing all images from 2020 itself, if any)
• 02 Feb (containing all images from 2020/02 Feb itself, if any)
• Vacation (containing all images from 2020/02 Feb/Vacation AND 2020/08 Aug/Vacation)
• John (containing all imags from Birthdays/John)
• Jane (containing all imags from Birthdays/Jane)
• Skiing 2023

Album Level Ranges

It is possible to specify not just a number for --album-levels, but a range from level x to level y in the folder structure that should make up an album's name:
--album-levels="2,3"
The range is applied to the folder structure beneath root_path from the top for positive levels and from the bottom for negative levels. Suppose the following folder structure for an external library with the script's root_path set to /external_libs/photos:

/external_libs/photos/2020/2020 02 Feb/Vacation
/external_libs/photos/2020/2020 08 Aug/Vacation

• --album-levels="2,3" will create albums (for this folder structure, this is equal to --album-levels="-2")
  • 2020 02 Feb Facation
  • 2020 08 Aug Vacation
• --album-levels="2,2" will create albums (for this folder structure, this is equal to --album-levels="-2,-2")
  • 2020 02 Feb
  • 2020 08 Aug

Important

When passing negative ranges as album levels, you must pass the argument in the form --album-levels="-2,-2". Emphasis is on the equals sign = separating the option from the value. Otherwise, you might get an error argument -a/--album-levels: expected one argument!

Warning

Note that with negative album-levels or album level ranges, images from different parent folders will be mixed in the same album if they reside in sub-folders with the same name (see Vacation in example above).

Since Immich does not support real nested albums (yet?), neither does this script.

Filtering

It is possible filter images by either specifying path patterns to include or keywords which will ignore an image if its path contains any. Two options control this behavior.

Ignoring Assets

The option -i / --ignore or Docker environment variable IGNORE accepts a semicolon-separated : list of keywords. If an image's path contains that keyword, it will be ignored.

Example:
--ignore "Vacation:Birthday" will not include any images for which the path below the root path contains either Vacation or Birthday. Albums will not be created for these images and they will not be added to albums.

Filtering for Assets

The option -f / ---path-filter or Docker environment variable PATH_FILTER accepts a glob-style pattern to filter for images for which the path below the root path matches the provided pattern. Only these images will be considered for album creation.
The following wild-cards are supported:

Pattern	Meaning
*	Matches everything (even nothing) within one folder level
?	Matches any single character
[]	Matches one character in the brackets, e.g. [a] literally matches a
[!]	Matches one character not in the brackets, e.h. [!a] matches any character but a

Tip

When working with path filters, consider setting the -A / --find-assets-in-albums option or Docker environment variable FIND_ASSETS_IN_ALBUMS for the script to discover assets that are already part of an album. That way, assets can be added to multiple albums by the script. Refer to the Assets in Multiple Albums section for more information.

Examples:
Consider the following folder structure:

/external_libs/photos/
├── 2020/
│   ├── 02 Feb/
│   │   └── Vacation/
│   ├── 08 Aug/
│   │   └── Vacation/
├── Birthdays/
│   ├── John/
│   └── Jane/
└── Skiing 2023/

• To only create a Birthdays album with all images directly in Birthdays or in any subfolder on any level, run the script with the following options:
  • root_path=/external_libs/photos
  • --album-level=1
  • --path-filter Birthdays/**
• To only create albums for the 2020s (all 202x years), but with the album names like 2020 02 Feb, run the script with the following options:
  • root_path=/external_libs/photos
  • --album-level=2
  • --path-filter=202?/**
• To only create albums for 2020s (all 202x years) with the album names like 2020 02 Feb, but only with images in folders one level below 2020 and not any of the Vacation images, run the script with the following options:
  • root_path=/external_libs/photos
  • --album-level=2
  • --path-filter=202?/*/*
• To create a Vacation album with all vacation images, run the script with the following options:
  • root_path=/external_libs/photos
  • --album-level=-1
  • --path-filter=**/Vacation/*

Automatic Album Sharing

The scripts support sharing newly created albums with a list of existing users. The sharing role (viewer or editor) can be specified for all users at once or individually per user.

Album Sharing Examples (Bare Python Script)

Two arguments control this feature:

• -o / --share-role: The default role for users an album is shared with. Allowed values are viewer or editor. This argument is optional and defaults to viewer.
• -x / --share-with: Specify once per user to share with. The value should be either the user name or the user's email address as specified in Immich. If the user name is used and it contains blanks , it must be wrapped in double quotes ". To override the default share role and specify a role explicitly for this user, the format <userName>=<shareRole> must be used (refer to examples below).

To share new albums with users User A and User B as viewer, use the following call:

python3 ./immich_auto_album.py --share-with "User A" --share-with "User B" /path/to/external/lib https://immich.mydomain.com/api thisIsMyApiKeyCopiedFromImmichWebGui

To share new albums with users User A and User B as editor, use the following call:

python3 ./immich_auto_album.py --share-with "User A" --share-with "User B" --share-role "editor" /path/to/external/lib https://immich.mydomain.com/api thisIsMyApiKeyCopiedFromImmichWebGui

To share new albums with users User A and a user with mail address userB@mydomain.com, but User A should be an editor, use the following call:

python3 ./immich_auto_album.py --share-with "User A=editor" --share-with "userB@mydomain.com" /path/to/external/lib https://immich.mydomain.com/api thisIs

Album Sharing Examples (Docker)

Two environment variables control this feature:

• SHARE_ROLE: The default role for users an album is shared with. Allowed values are viewer or editor. This argument is optional and defaults to viewer.
• SHARE_WITH: A colon : separated list of either names or email addresses (or a mix) of existing users. To override the default share role and specify a role explicitly for each user, the format <userName>=<shareRole> must be used (refer to examples below).

To share new albums with users User A and User B as viewer, use the following call:

docker run -e SHARE_WITH="User A:User B" -e UNATTENDED="1" -e API_URL="https://immich.mydomain.com/api/" -e API_KEY="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" -e ROOT_PATH="/external_libs/photos" salvoxia/immich-folder-album-creator:latest /script/immich_auto_album.sh

To share new albums with users User A and User B as editor, use the following call:

docker run -e SHARE_WITH="User A:User B" -e SHARE_ROLE="editor" -e UNATTENDED="1" -e API_URL="https://immich.mydomain.com/api/" -e API_KEY="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" -e ROOT_PATH="/external_libs/photos" salvoxia/immich-folder-album-creator:latest /script/immich_auto_album.sh

To share new albums with users User A and a user with mail address userB@mydomain.com, but User A should be an editor, use the following call:

docker run -e SHARE_WITH="User A=editor:userB@mydomain.com" -e UNATTENDED="1" -e API_URL="https://immich.mydomain.com/api/" -e API_KEY="xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx" -e ROOT_PATH="/external_libs/photos" salvoxia/immich-folder-album-creator:latest /script/immich_auto_album.sh

Cleaning Up Albums

The script supports differnt run modes (option -m/--mode or env variable MODE for Docker). The default mode is CREATE, which is used to create albums. The other two modes are CLEANUP and DELETE_ALL.

Caution

Regardless of the mode you are using, deleting albums cannot be undone! The only option is to let the script run again and create new albums base on the passed arguments and current assets in Immich.

To prevent accidental deletions, setting the mode to CLEANUP or DELETE_ALL alone will not actually delete any albums, but only perform a dry run. The dry run prints a list of albums that the script would delete.
To actually delete albums, the option -d/--delete-confirm (or env variable DELETE_CONFIRM for Docker) must be set.

CLEANUP

The script will generate album names using the script's arguments and the assets found in Immich, but instead of creating the albums, it will delete them (if they exist). This is useful if a large number of albums was created with no/the wrong --album-separator or --album-levels settings.

DELETE_ALL

Caution

As the name suggests, this mode blindly deletes ALL albums from Immich. Use with caution!

Assets in Multiple Albums

By default, the script only fetches assets from Immich that are not assigned to any album yet. This makes querying assets in large libraries very fast. However, if assets should be part of either manually created albums as well as albums based on the folder structure, or if multiple script passes with different album level settings should create differently named albums with overlapping contents, the option --find-assets-in-albums (bare Python) or environment variable FIND_ASSETS_IN_ALBUMS (Docker) may be set.
In that case, the script will request all assets from Immich and add them to their corresponding folders, even if the also are part of other albums.

Tip

This option can be especially useful when Filtering for Assets.

Dealing with External Library Changes

Due to their nature, external libraries may be changed by the user without Immich having any say in it.
Two examples of this are the user deleting or renaming folders in their external libraries after the script has created albums, or the user moving single files from one folder to another. The script would create new albums from renamed folders or add images to their new album after they have been moved.
Immich itself deals with this by marking images/videos it no longer sees in their original location as "offline". This can lead to albums being completely populated by "offline" files only (if the folder was renamed or deleted) while they exist normally in a new album or with single images being offline in one album, while existing normally in their new albums.
There is an administrative option to trigger deletion of "offline assets" from libraries in the Immich Admin Interface. However, in the first example this might leave behind empty albums if the album only contained offline files.

To clean up this mess this script offers an option called Sync Mode. It is an optional argument / environment variable that may have values from 0 to 2. The following behaviors wil be triggered by the different values:

• 0: No syncing (default)
• 1: Delete all empty albums at the end of a run
• 2: Trigger offline asset removal for all libraires

Important

Sync Mode 2 / Triggering offline asset removal requires the API key of an Admin User!

The complete syncing process consists of two stages:

1. Trigger Offline Asset Removal This will start a background job for each library to find and delete files from Immich's database that are marked as 'offline'. It is asynchronous and might take some time (depending on the size of the databases and the numver of offline files). Offline Asset Removal can only be triggered by Administrators, so the API Key used for this sync mode must be one of an Administrator. This might not be the same you use for creating albums!

2. Delete Empty Albums Step 1 might leave behind empty albums for a different user. The script is capable of removing empty albums at the end of a run to clean up after Offline Asset Removal.

Caution

It is not possible for the script to distinguish between an album that was left behind empty after Offline Asset Removal and a manually created album with no images added to it! All empty albums of that user will be deleted!

It is up to you whether you want to use the full capabilities Sync Mode offers, parts of it or none.
An example for the Immich docker-compose.yml stack when using full Sync Mode might look like this:

#
# WARNING: Make sure to use the docker-compose.yml of the current release:
#
# https://github.com/immich-app/immich/releases/latest/download/docker-compose.yml
#
# The compose file on main may not be compatible with the latest release.
#

name: immich

services:
  immich-server:
    container_name: immich_server
    volumes:
     - /path/to/my/photos:/external_libs/photos
  ...
  immich-folder-album-creator-offline-asset-removal:
    container_name: immich_folder_album_creator
    image: salvoxia/immich-folder-album-creator:latest
    restart: unless-stopped
    environment:
      API_URL: http://immich_server:3001/api
      # Admin User API Key
      API_KEY: yyyyyyyyyyyyyyyyyy
      ROOT_PATH: /thisIsADummyPathThatDoesNotExist
      CRON_EXPRESSION: "0 * * * *"
      TZ: Europe/Berlin
      # Regularly trigger offline asset removal
      SYNC_MODE: "2"
  immich-folder-album-creator:
    container_name: immich_folder_album_creator
    image: salvoxia/immich-folder-album-creator:latest
    restart: unless-stopped
    environment:
      API_URL: http://immich_server:3001/api
      API_KEY: xxxxxxxxxxxxxxxxx
      ROOT_PATH: /external_libs/photos
      # Run 10 minutes past the hour to give Offline Asset Removal time to work
      CRON_EXPRESSION: "10 * * * *"
      TZ: Europe/Berlin
      # Delete empty albums after each run
      SYNC_MODE: "1"

The immich-folder-album-creator-offline-asset-removal service has the one and only purpose of triggering Offline Asset Removal, since we do not want to create albums for the Admin User. Thus, a dummy ROOT_PATH is passed so that the script will never find any assets to create albums from. SYNC_MODE is set to 2 to regularly trigger Offline Asset Removal.
The immich-folder-album-creator service is the normal service for creating albums from an external library. The cron job triggers 10 minutes past the hour, whereas Offline Asset Removal is trigger at the full hour. This gives the job 10 minutes of time to run before any empty albums are deleted at the end of the run due to SYNC_MODE being set to 1.