Quote:
Originally Posted by odamizu
Oh, the irony! Amazon won't accept MOBI, but will accept EPUB only to send it back to Kindle for iOS as MOBI 
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Epub has been Amazon preferred upload for publishing for years with docx as 2nd. Acceptance of reflowable mobi for publishing ended ages ago. So they seem to be making the "Send to Kindle" use the same sort of infrastructure as Amazon KDP (the Publishing upload for all but big publishers).
I'm sure it's an Apple issue that they deliver mobi (used on prehistoric kindles K1, K2, DG, DXG etc before K K3 with later firmwares) for iOS. They'd certainly prefer to deliver azw3/KF8 or KFX.