

You can read this article How can I import my personal documents to my Kindle app on iPad/iPhone to check the reason why it can’t. That’s because AZW3 isn’t one of the eBook formats supported by the Kindle Personal Documents Service. Amazon’s Send-to-Kindle service doesn’t apply, either. We’ve tested and found that AZW3 files cannot be read on Kindle for iOS but can be read on Kindle for Android. However, Kindle for iOS is not an option when it comes to reading AZW3 books on an iOS device. Hence, the DRMed AZW3 books can only be read on Kindle related devices or apps. It’s universally known that AZW3 is the Amazon proprietary format and all AZW3 books delivered by Amazon have DRM encryption.
