If you are/were running Jellyfin 10.9.4, check you library for missing files, as it had a file deleting bug. Might be a good idea to rollback to a snapshot made before the upgrade to the buggy version.
For more info, see:
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Joke’s on them! All my media folders, of which Jellyfin has access to (via a jail mountpoint) are read-only. 
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10.9.6 is already in the Apps catalog - go ahead and update now 
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My jellyfin user doesn’t have write access to my media dataset.
But the media dataset is mounted r/w into the sandbox because I run a docker job to download all recent recordings from my dvr
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