Hi @sylandro, LaunchBox is supposed to append the unique id of the game to a game's image file names when it detects that there is more than one game with the same title for a specific platform. I trust that this is working, though I haven't tested it recently. That said, if you manually move images over to the folder, this of course won't automatically work.
It would probably be worth creating a decent test scenario for this. I believe if you edit a game, it should be assigning the unique game IDs to the image files. The game IDs are GUIDs that look like a serious of random letters, numbers, and dashes.