Ability to add images from external NameMapping file upon merge with local NameMapping file

I have 2 NameMapping files, say NameMap1 and NameMap2, that have different objects captured of the same application. I had opted to capture images automatically in both of the NameMapping files.

Upon merge of NameMap2 file into NameMap1, the images from NameMap2 are not seen updated in the merged NameMap1 file at all. It would be great to have this ability, as I have hundreds of objects in both files, and do not wish to manually update images for objects in either of the files again.