Jellyfin in proxmox container can't access media on synology drive

[TheDreadPirate]

Not sure if running Jellyfin in a VM will change things.

FYI, this might be better to ask on a Synology or ProxMox focused forum or subreddit. Since the problem is rooted in your NAS/ProxMox permissions and not Jellyfin.

Someone around here might come along that has a similar setup.

But my only tip is that the user your Jellyfin container is running as needs to have permissions to the share you mounted in ProxMox. For example, if only root has access to that share in ProxMox and the Jellyfin container is being run as your user (which is the typical advice) then yeah Jellyfin won't be able to access it.