I currently have a jellyfin server on a rpi4 running raspbian (I think). I’m planning to migrate that to a Dell Wyse mini pc before I go on a month long trip. I would like to be able to ssh into it from outside my home and add movies and stuff. I have already setup ddns for the jellyfin server, so I only need for a way to add movies to it.
Do you have ssh access running on local network? If so, all you have to do is forward the port. I’d recommend exposing a non-standard port, also using keys rather than password.
If you don’t have your sshd running yet, it sounds like you need to read some guides to get a foundation, then come back with specific questions.