NPS is a tunnel service similar with Ngrok, it’s a reverse proxy used to access local service behind the NAT/Firewall. If you are running self-hosted service like Lomorage at home, and you are outside and want to access Lomorage, then you can use NPS.

However NPS need to run somewhere with public access, there are lots of service providers there, fly.io has a free plan without binding any credit card, and it supports docker deployment, and the servers runs in datacenters around the world so that the service can be deployed close to the users.