I know there have been numerous recommendations to upload pictures to hosting sites. But all I did was resize my chosen picture to just under the required size, keeping perspective, and uploaded it. And it worked.

Yeah, this is problem. I did the same that you say (to resize) but it didn't be useful to me frown
He that is slow to believe anything and everything is of great understanding, for belief in one false principle is the beginning of all unwisdom.
-The Book Of Satan 2:7-