It would be a nice little feature to have your image viewer of choice pop up somewhere down in the Export menu, but making such exported file a temporary one.

The reason behind this is the following: at a given moment, I may have two or three screenshots to simultaneously deal with in Gwenview (which automatically opens on Export > Gwenview as of now). These screenshots are short-lived in my use case, meaning the moment I close them I won't be ever using them again. It's a hassle to be deleting those files after the disk gets progressively filled with them. Moreover, I may or may not delete some important files in the progress (deleting loads and loads of files will do that to you).