I’ve used the Jellyfin app and it’s really finicky. Swiftfin, Finamp and Infuse don't even display my audio book library. Is there another way to do it that I’m missing?
I am assuming you are using the Books type library for your audio books. Which is what you should be using since the Music library doesn't support playback tracking/resume. Those clients do not support Books libraries.
Jellyfin 10.9.10
Ubuntu 24.04 LTS (bare metal)
Intel i3 12100 on Asus Prime H610M-E D4 mATX
32GB DDR4-3600
Intel Arc A380
OS drive - SK Hynix P41 1TB
Storage
WD Green 3TB (Samba shares)
WD Red 3TB CMR (WIP Media, Test libraries)
3x WD Red Pro 6TB CMR in RAIDZ1 (JF Library)
Fractal Meshify 2
Corsair CX430