Nextcloud page no longer reachable after Nginx (re)installation and configuration

I am running Nextcloud on TrueNas Core, installed via a plugin. I have two webpages I want to host in different jails, so I attempted to create a reverse proxy, but ended up causing a disconnect between the nextcloud page and its IP and domain. I tried disabling and reinstalling Nginx, but whenever I run it a test page is all that pops up, and there’s nothing when I stop Nginx. How do I re-access my Nextcloud page? I can’t find any way to just start it from the terminal.