Re: why rich capture doesn`t work in windows camera?
I had the same issue on my Lumia 640, believe it or not. (Yeah, I know the 640 doesn't compare with the 1520, but follow this anyway.)
There is a conflict between the Photos plug-in app, and Lumia Camera, and there were some other legacy Lumia photo apps that were also involved. When I uninstalled all of those, the issues went away and I was able to start choosing the best lighting, and things sped up a bit as well.
Hope the same works for you. Can't remember all the app names, as they are now "gone" from my phone. You'll probably know if you have them, though.