You should not upload the screenshot at the time of SUBMISSION of binary.
But you should wait til your binary is approved (ie the famous Ready For Sale email).
then only you upload your screenshots. And after uploaded them, please do not forget to press the "Save Changes" button at below of the Upload page in itunesconnect. That is crucial step. I did upload before and found out that if you just upload, but did not "Save CHanges", it wont be applied.
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