I'm in a 'redirect loop' trying to use page domain with nginx.

Hi. I want to use @Cloudflare/next-on-pages, but I cannot figure out how to successfully get my docker nginx proxy manager to work (currently stuck in redirect loops). My goal is to have the endpoints starting with '/api' and '/auth' go to my VPS's IP for ExpressJs, and everything else go to the page domain 'DOMAIN.pages.dev'. What am I missing? Any help is greatly appreciated, thanks!