No media found

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Use code blocks (braces "[ ]" with the word code inside to start the block and /code to end the block) and paste your code in between.

Code:

Keeps formatting, changes font to monospace, truncates to \
    a reasonable amount of lines and columns.

That said, doesn't look complex. Could you ls -l both inside and outside the container? You should be able to just run the command instead of having to exec into the Jellyfin container but I'm on mobile at the moment so can't test. I'm interested in the perms on /data/media but also on at least one or two of the folders underneath. So both the permissions flags or string as well as the u/g owners.