Support .DNG files and stop treating them as Files and treat them as Photos
As mentioned by other, please support .DNG file. I can understand not supporting proprietary formats from camera makers, but .DNG is an open platform and should be supported on OneDrive.com.
Showing these as files and not photos is making me and probably others move to Google or other platforms for my Photos as they display .DNG files no problem on their web site.
This is especially important now that other phone manufacturers are supporting .DNG files. Overall, the fact that Windows phones did and you still didn't add support really tells us consumers that you are not interested in this business.