Jellyfin doesn't recognize directory (Ceph pool)

[gadgetboy]

TL;DR: I'm trying to narrow down an issue where Jellyfin does not recognize a directory that I created on a Ceph storage mount running in a VM on a Proxmox cluster. 

My first thought is that this is a problem with permissions, but I'm not sure where to go from here, since they seem correct. The Proxmox and Ceph subreddits indicate that everything should work based on what I described. ¯\_(ツ)_/¯

What would you suggest?

I have a Debian 12 VM on Proxmox VE with user gadgetboy (1000:1000). In the VM I've mounted a Ceph pool (media) using the Ceph linux client at /mnt/ceph

I can read and write to this Ceph pool from the VM CLI as this user.

Jellyfin is running via Docker on this VM using the yams script (https://yams.media). Under this same user, the yams setup script was able to write to /mnt/ceph/media and created a directory structure for media management. The PGID:PUID for the yams script and the resulting Docker Compose file match the user.

Jellyfin cannot read or write to this pool when attempting to configure a Library through the web interface - mnt appears empty when traversing the file system through the web interface.

/mnt/ceph is obviously owned by root. /mnt/ceph/media is owned by gadgetboy.