I found that if I go to Settings->Privacy->Photos on my iPhone. There is no Blue Iris listed as being an app that has requested access to access photos. Of course there is no way to add an app that I know of.
I’m having the same problem. Uninstalled, reinstalled. iPhone X on iOS 11.1. After reinstalling it never asks for permission to save to the camera roll. It won’t even save pictures from BI.