[ohIdon'tknow]

I double-checked to make sure it was running. It was definitely running but nothing was coming out. I thought it might be something to do with permissions so I made everything writeable. Still nothing.

Rather than beating my head against this wall for the next week I'm going to try the Nextcloudpi docker instead. I've had Nextcloudpi running as a standalone os on the pi so I'm hopeful it will work. There's also a NextCloud OPDS app. Though I'm not sure if this works like COPS or if it needs an OPDS reader.