I'm trying to upload app to Appstore but getting couple of errors, one related to icon transparency and other seems due to the same issue. I tried multiple version of png, jpeg after removing alpha channel but no success. Any clue why this error message is coming?
I could upload the image to ituneconnect App icon and it works there.
Although first error points this is "description length" issue, I was able to solve this by just removing the alpha channel of ios marketing icon, the big 1024x1024px image. There are probably other tools that can do this but I used ImageMagick from the command line, like this:
After removing alpha channel from marketing icon image, I was able to upload the app with no problems.