There seems to be a slight problem if you use a file name the same as someone else already used, I tried using a different filename and that fixed it (the problem was that it showed some other screenshot rather than mine).
There seems to be a slight problem if you use a file name the same as someone else already used, I tried using a different filename and that fixed it (the problem was that it showed some other screenshot rather than mine).
I noticed that as well when I was trying to update a screenshot posted earlier. It just seem to ignore the upload.