You’re not connected to wifi or vpn from the looks of it. jellyfin is hosted on your local network. You need to be connected to that network for any device you want to access it. The most direct way is to connect via wifi. If you want access from outside your house you’ll need to look into opening a remote connection via something like cloudflare tunnel

Logseq to some extent, but it’s set up to be a journal/ meeting notes where you tag pages, add documents, etc. it would be up to how you’ve tagged things. Does have a graph view of your pages and whiteboard feature.

Personally it wasn’t exactly what i wanted out of a PKM but it is really powerful. It’s intended to handle taking notes efficiently from meetings and then somewhat self organizing the notes as long as you tag stuff.