I have been having FRUSTRATIONS with KDP on getting my covers accepted. Not any more... thanks to Harleigh Manske at Kidlit Author Growth Academy
Harleigh actually made a free tutorial for me on creating your cover in Canva. After joining her premium community, she actually took my rejected cover and made it KDP compliant and DM'd it to me. It got published right away! Thank you Harleigh. I will be consulting with her to learn the process.
Go join her group - she has lots of free information and is extremely helpful.
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