I'm sure you can upload AZW3 to Cloud Drive... but I don't believe that will allow you to download it on a Kindle.
Cloud Drive is their cloud-storage service, not their Kindle syncing service. You can upload anything you want, pictures, videos, music, books, disk images, program binaries, you name it. But it has nothing to do with Personal Documents Storage or e-ink devices.
(That being said, I believe Personal Documents are automatically synced to your Cloud Drive.)
Last edited by eschwartz; 08-20-2015 at 04:34 PM.
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