I'm trying to upload a map and its only 21k KB (0.21 MB), which should be well within the limit of the 5 MB limit for free users. However, the site says that either the file is too big or my connection is not good. The thing is, I can upload any of my other smaller files just fine and as previously stated, the file size is within the limits of a free user. So why is this happening? How can this be fixed?