

Are the files within the folders the media folder also with permissions 775 (rwxrwxr-x)? The actual .mkv .mp4 or whatever files themselves should be the same permissions as the parent folder(s). Could be worth doing a chmod -R 0775 d64ea996-98aa-4eef-8a93-0a2ba2246f0f if you’re not sure.
You probably already tried this but just in case: In the Jellyfin admin pages, in Libraries, try removing that media library, then re-add the media library and when adding Folders paste in your entire media folder path/name: /media/velummortis/d64ea996-98aa-4eef-8a93-0a2ba2246f0f
The reason I mention that is that I did a quick test here with a bad permissioned folder, added the media folder, Jellyfin couldn’t see anything in it obviously. But even after I fixed the folder permissions Jellyfin still wasn’t seeing the media - I had to remove the library entirely and then re-add it to force Jellyfin to attempt to scan the folder with new 775 world permissions.



Four spaces before the line you want to codify :)
e.g.
vs non-formatted
UUID=“your uuid” /mnt/external exfat defaults,uid=1000,gid=“your group id”,umask=002,nofail 0 0