I found the solution. I have spent 2 whole days and it's simple. For a reason that I don't understand, if you're having the 'There are screenshot uploads in progress' message, you just need 1) be patient, there's a MDFK gray image somewhere at the "optional" screenshots that need to be deleted. Go to 'View All Sizes in Media Manager' and check all the devices, the required, and the optional ones. I'll promise there's a gray image with a cloud icon. Just delete that image and submit. that will fix the problem If didn't found any gray image, then change the language, and start all over again. You will find it. be patient Apple please, fix this. At list, insert a MDFK button that can erase all screenshots at once.