COMMUNITY FORUM

I have a map that I want to use as the basis for another map.  My usual procedure is to duplicate the existing map with the new name, then edit the new map.  But one map won’t duplicate.  It just gives me a generic error “map could not be duplicated”.  I exported the existing map, changed the file name, and tried to import it.  But it says “no importable entities were found in the selected file”, and it won’t import.
What am I missing?  Thanks!