Maybe one day ProtonVPN will fix their port-forwarding for their configuration files, I haven’t seen anyone else complain about this and their support is oblivious that this function even exists.
For people wondering the Learn More link just tells you what port forwarding does.
Radarr (Movies) / Sonarr (Shows/Series) - You search for a movie/show, you hit the “I want that” button, it does the searching through Torrents or Usenet, once it find a match it send a signal to your download client to begin downloading, once done Radarr/Sonarr will take that file and neatly manage it for your media viewer (Jellyfin) essentially automating the entire process.
There is quite a bit of configuration needed for things start to flow smoothly but relatively straight forward.
So if I’m not mistaken the route I took was to import my Spotify library to Lidarr > Let it freely torrent/download in the background (this can take a long time especially if what you’re torrenting isn’t very popular!) > setup the Spotify Import plugin for Jellyfin and let that automatically make your playlist an such however, in my experience this worked well for maybe 40% of my playlists (roughly 800 rap songs + 200 rock/metal) and the rest I downloaded with ytdlp and manually added in to my library, which sucked because it was so tedious but once I got it done I never had to do it again.
I got about 15k songs in my library all together but only listen to my playlists.
Firm believer in Legitflix.
I mean I’ll give it a try, their support flat out said they don’t support port forwarding for WireGuard configs which is why I never used the feature, but if it’s truly using UPnP than it may be worth a shot!
Edit: https://protonvpn.com/support/port-forwarding-manual-setup#wireguard looks promising!