> I just ended up exposing my public IP.

I considered doing that too. My main problem with it is privacy. Let's say I set up some sort of dynamic DNS to point foo.bar.example.org to my home IP. Then, after some family event, I share an album link (https://foo.bar.example.org/share/long-base64-string) with friends and family. The album link gets shared on, and ends up on the public internet. Once somebody figures out foo.bar.example.org points to my home IP, they can look up my home IP at all times.