Hi! I am using the latest version of CC (the 2017 update). I'm new to Lightroom, so I can't tell you if this is something that worked before, or if I'm just not doing it correctly. I'm trying to merge photos to create an HDR image. I keep getting this error message "Unable to merge photos. Please cancel and review your selection." The photos that I'm trying to merge are bracketed shots, so they were taken within milliseconds of each other at the same focal length. The only difference is the exposure. I tried doing some merges with two photos and some of them worked, some of them didn't. The message pops up seemingly at random. Can you tell me what is causing this error? I'd love to be able to combine all three photos from the same bracket. Thanks!