same here. book sometime only show up on a particular device but not on other device, even though I send them to kindle email or upload on aws ui. I ended up ju

same here. book sometime only show up on a particular device but not on other device, even though I send them to kindle email or upload on aws ui. I ended up just ditch it and use Apple Book. Though I still have book that only available on Kindle cuz I bough them on AWS. I wish it has an easy way to export those to Apple Book.