I did some more testing and I can access my Nginx Proxy Manager from outside my network. The issue appears to be accessing the self-hosted applications on my home server, mainly Jellyfin. I still think the issue is the IP conflict with Tailscale. NPM is fairly easy to configure and is setup correctly with my domain name.
One of the most useful features of Google Forms is automatically transferring the form input to a spreadsheet. Any of FOSS alternatives have that ability?