Taildrop works relatively well for most all circumstances. Only thing is you gotta use trayscale or cli currently for sending files from a Linux/bsd machine. I don’t know if opened has a port for trayscale but it definitely has a port of tailscale.

Networking is fun because there are literally infinite potential options. There really isn’t a best option. It’s just what do you prefer. In my case I like to write a docker compose and write a tailscale container into it. I then set the service I want to expose either to my own tailnet or to the internet through funnel or though this other implementation I came up with a while back that I still need to do a write up on. Either way here is a guide i wrote with some docs as reference on my forgejo (git alternative). Docs are kinda a mess but hopefully it makes sense enough to help you out.

Tailscale docker compose examples