Change subtitle download location

[TheDreadPirate]

Instead of mounting the share in Proxmox then passing it into the LXC, you could just mount it directly in the LXC in the same way you did in Proxmox to remove one layer of things we need to work through.

On the NAS, I'm assuming either a QNAP or Synology NAS, what permissions did you set in the UI? Can you show that?

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I missed your update. I don't recommend giving the jellyfin user a permanent bash shell the way you did. You can give the jellyfin a temp bash shell with "su -s /bin/bash jellyfin".