Some exports come with some transparency (usually, a small bar just above the text), which is then refused on the App Store Connect. It’s possible to remove it using Photoshop tho.
Would it be possible for you to fix that ?
Example below :
Remove alpha channel from screenshots
Upvoters
Status
Completed
Board
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Feature Request
Date
4 months ago
Author
Skyost
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Upvoters
Status
Completed
Board
💡
Feature Request
Date
4 months ago
Author
Skyost
Subscribe to request
Get notified by email when there are changes.