I have tried to "Create Map". I have done so successfully five times today. I am now uploading a sixth, and now the "Proceed" button just isn't working. It is registering as a click, but it doesn't do anything. As attempted fixes, I have:
Clicking "add map", typing in the name of the map, and then pressing "proceed"
Does your title have 3 letters in it for the sixth map?
It did, and I've added a fourth character, and that has resolved it - thank you!