All my books have been run through Calibre with no problem. I don't sideload though I send the book through email or Send to Kindle to my Personal Documents cloud. I've never had a problem. You can't send KF8 yet though those do have to be sideloaded still.
You need a K3-3.4, K4-4.01 , KT or KF to read AZW3 (KF8)
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