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 10.10.7 (Docker)
Ubuntu 24.04.2 LTS w/HWE
Intel i3 12100
Intel Arc A380
OS drive - SK Hynix P41 1TB
Storage
4x WD Red Pro 6TB CMR in RAIDZ1