Still getting the infinite upload bug sadly. It's been on every single map I've made. Which is a real bummer. My maps are big, so maybe it has something to do with having too many objects? which that's fine, but if that is a problem maybe there should be a limit we know about.
sooo a weird thing I just did fixed it for me, I created a new map and saved it, closed the program, then I copied the save data from a map that wasn't uploading to the new map in notepad++ and then I was able to upload it. No idea why that would work since the data is all the same after the edit but it did.
(map size was 26 MB)