Managed to spin up Opencloud on my NAS. I put a host entry in NPM and it seems to be working. From external internet I can log in and upload files with no issues. But whenever I try to reach it through local IP and port, page loads but stays completely blank.

Googling didn't give reasonable leads. Has anyone had similar issue that they've fixed?

Edit: Forgot to write a solution that I have found.

It seems that Opencloud has to be accessed though an secure connection with a working SSL cert. My solution is to utilize local DNS service (in my case, pihole) and redirect dns record to your reverse proxy to be solved there. In my case op.example.com goes to a NPM on a local machine that answers with an Opencloud site. Page will be white/black for a few secs for some reason, but it will load webpage and will let me in.