I have tried everything minus driving to Amazons headquarters to get my png to upload. However, I continue to get the same error. The image is transparent, is the correct size (4500 x 5400, its a PNG file, smaller than 25MB, and 300 dots.
Also, i have tried to clear cookies, log out, and about everything else including using different computers and internet providers (locations) to see if some way this would get uploaded. I have contacted Amazon and they can not help other than give me the same line about what is required. They said to turn to here.. Can anyone give me a tip?