I have imported Amiga games in the past, using UUID Exporter, and not had any problems. Still have games in Launchbox.
I tried importing a new Amiga UUID game folder into Launchbox today, and even though I select the Import Folder Names option, the final screen of the Import Wizard is blank as though it doesn't want to import a folder. I can import games no problem using rom, iso, etc. Not sure what I'm missing here.