SOLVED: Path /home for media library

[TheDreadPirate]

I'm assuming you are using a Synology NAS to both run Jellyfin and store your media?

Since the media is in your home directory, the permissions are likely locked down starting at /volume1/home/usernames. With Linux, the user you are trying to grant access to needs permissions on every folder in the path. So if you granted Jellyfin permission to read /volume1/home/username/foldername/, but not /volume1/home/username/, Jellyfin will not be able to access "foldername" due to not having access to the parent folder.