Depends on what the current group ownership is. If it is root:root jellyfin doesn't have access to it. Needs to be 755 so that jellyfin can get into the folder.
Jellyfin 10.10.3 (Docker)
Ubuntu 24.04 LTS
Intel i3 12100
Intel Arc A380
OS drive - SK Hynix P41 1TB
Storage
3x WD Red Pro 6TB CMR in RAIDZ1 (JF Library)