App Store Connect says my screenshots are not in the RGB color space, but they are

I am trying to add a new screenshot in either the png or jpg format to a product page of an existing app. When I try to reorder the screenshots, App Store Connect says the new screenshot is not in the RGB color space. Preview, which created them, and Finder both say they are in the RGB color space. What should I do?

Do you get the screenShots with Cmd-S in simulator ? It will be a png, which is required. And it will be of the correct size.

App Store Connect says my screenshots are not in the RGB color space, but they are
 
 
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