There doesn't seem to be any application for the DNR-312L for the android. There is View-NVR but that's designed to work for with the 202L. So my only option is to use the web based access, which is what doesn't work. It partially works, but like I said, no cameras detected and no videos shown.
I have tested this on OS version 5.1.1 and now 6.0.1. And on 2 different devices (Samsung 6+ phone and Samsung Tablet), as well as 3 different web browsers. Apps have been removed and reinstalled.
It's beginning to look like the DNR-312L is not compatible with smart devices. Guess it's time to recheck the manual and see if it is compatible with android.
Since the interface is web based, I would think it should work, but it doesn't.
This is how it looks on my PC.
This is how it looks on my android