I have for years cleaned up Word docs as html files (most recently using NoteTab Pro) and pasting the html file into a new epub2 document on Sigil. I add a standard style sheet, link to it, and then split the epub into chapters. I've been uploading the epubs to Kindle Direct Publishing since 2012 and have never had a problem. I then add a cover and upload an otherwise identical epub to Draft2Digital. I've never fussed with the so-called "mobi" file.
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