I do seem to encounter an issue with DOpus 12 (also DOpus 11) and the way it opens file within the default Photo UWP app in Windows 10.
The problem is the following. When I use the defualt Windows Explorer in Windows 10 and I open any image (JPEG) that resides in a folder full of images, the Photo app knows that it's just one of the many images and lets me navigate forward and backward to see other photos.
This is not the case with DOpus - it opens just the one image and does not allow me to go back or forth. Each image has to be opened separately.
Is there any way around this issue, or am I doing something wrong?