How can I share a network folder to a Windows or Linux PC

[KC9UDX]

I use Samba between my Android phone and a NetBSD server. It should be even easier to do that with a Pinephone. I only use it because it is faster than FTP.

There is always NFS.

I would expect the ISP shouldn't come into play for a local network. Back when (~1997), I ran a public webserver from a dynamic IP, I would have the server (running Amiga 3.1) email me the new IP address whenever it changed. Then I would manually update the domain's IP on the web.