collection

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Are your media files stored on a network share?  There is a job that runs on startup that cleans up playlists and collections when the associated media is not available.  You can try disabling this job.

Dashboard > Scheduled Tasks > Cleanup playlists and collections

Then delete the startup trigger.

I seem to have a similar issue. New to jellyfin i have added videos to a few collections about twice now and after a little bit of time they are all empty. I have them stored on an external hard drive. I havent tried deleting the cleanup playlists and collections task as i didnt want to do something and mess things up more.

Removing that cleanup playlist and collections task will not mess up anything. What it will do is solve the issue you are having.

thank you very much. will do that.