Nginx and nginx proxy manager are two different things, although nginx proxy manager uses nginx underneath the hodd.

Nginx is a lightweight reverse proxy and http(s) server configured via config files.

nginx.org/en/

Nginx proxy manager is a docker container that runs nginx, but also had a webui on top of it to make it much, much easier to configure.

Sometimes abbreviated as NPM.

nginxproxymanager.com

That’s why people keep asking you for your nginx config since when you just say nginx, people are expecting that you are using just nginx, and configuring it through text files.