Not tried it in years, but there was an app called fildo which I think you could give it a playlist url. It was buggy af though.

Would this help? https://forum.manjaro.org/t/howto-configure-wireguard-via-the-networkmanager-gui-advanced-network-manager/138040 Looks like you just need the wireguard config file from Netbird.

I do something similar and use syncthing to sync a folders on my phone to my server, I then use beets to manage my library (helps pull correct metadata) and jellyfin is just pointed to that folder. There’s a fork of the syncthing app on fdroid: https://f-droid.org/packages/com.github.catfriend1.syncthingandroid/

In case, like me, you hadn’t heard of Bazzite before:

Bazzite is an OCI image that serves as an alternative operating system for the Steam Deck, and a ready-to-game SteamOS-like for desktop computers, handheld PCs, and living room home theater PCs.