MAKE IT EASIER TO COMBINE GALLERIES

Trying to copy all the assets in one gallery, copy all the assets of another gallery…and PASTE both of those asset bunches, into a NEW gallery. Maybe I'm doing it wrong but, the NEWLY created gallery, once I'm inside of there…I see the two subfolders of what I copied, but I have no idea how to raise that to have both of things visible in the new gallery format that I created. I'm basically trying to take an ORIGINALS folder and a RETOUCHED folder, and ultimately create a SIDE BY SIDE folder to showcase originals vs. retouched. Can't figure out how to do it. And I cant download whole galleries for some reasons. (yes, the option to do so is selected.)