In the Jellyfin dashboard it will tell you what directory the logs are in. Find the timeframe that you had issues with playback and copy/paste them into a separate text file and attach it to a post.
Jellyfin 10.10.1 (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)