Amazon Merch & KDP have had changes to the upload process implemented recently

As a result you can't send too many requests to the Amazon servers in too short of a window

If you do, you'll see errors such as "Invalid PNG uploaded", or "Please provide a valid price", or the publish button will error out (on Merch)

On KDP, your interior or cover uploads may also error out and say "invalid", when in reality the server rejected your attempt at uploading

This video explains what's going on - I hope it helps! 🙂

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