Totally understandable, however basic tailscale version is free and you can just have that installed on all of the connected devices as a “reverse proxy”. You then use the ip adress from the server or main computer with the files and connect to its tailscale provided ip adress after turning it on and as long as you have port 8096 open on the server computer (http:/with your adress here:8096) you can connect to the server through the jellyfin app on the device you’ve installed it on.