Practical Steps for Uploading an E-Book to KDP/KindleK. M. Moody
I've never used Apple as a sales portal, so I can't say. I do know that writing a listing with even simple formatting on KDP/Amazon is very frustrating, because their guidelines and formatting rules are haphazard. I usually have to enter a listing and then correct it by guesswork ...
Any way back to the subject at hand Open your Word.doc file and do a SaveAs a (Filtered) web page ((Ignore the Warnings)) and direct the SaveAs to an empty file folder and then Zip the file folder (Once) and upload this to the KDP Bookshelf! This should work! Word puts a LOT...