I am kind of just making this up as I go along so odds are this won’t work but it will hopefully get you closer. I only modified the very end under the volumes from their default compose file here github.com/immich-app/…/docker-compose.yml
You will need to change the IP address to the address of you SMB server as well as the user name and password your going to be using. You may need to change the uid and gid I think you want those to be the id of whatever user is running immich. 1000 is usually a good default if you don’t know.
In the .env file try just putting in upload-volume as the upload location. Like this
UPLOAD_LOCATION=upload-volume
Oh I almost forgot your host computer (the one running docker) needs to have cifs-utils installed or the cifs volume will not work and you will get a bunch of errors (Ask me how I know).