Incidentally, if you DID put the maps in a different location then you’re going to have to setup that directory to be packaged.
You can do that in the editor by opening your Project Settings (in the Edit menu) and then look at the Packaging section. In there you can add your directory under the "Additional Non-Asset Directories to Package).
…Or you can keep your maps in the normal place.
This is all a big assumption though!