on New Shelves:
Kindle Direct Publishing (KDP) made a number of updates in May and June 2021. Here’s what you need to know about them.
KDP Is Now Accepting EPUB Files
Yes! It’s true. KDP is now accepting EPUB files for reflowable format eBooks.
“After June 28, 2021, we will no longer support MOBI files when publishing new or updating previously published reflowable eBooks. Instead, use EPUB, DOCX or KPF formats, see our Frequently Asked Questions for more information. MOBI files are still accepted for fixed-layout eBooks.”
Keep in mind Reflowable eBooks allow the reader to resize text and custom adapt to different screen sizes which accounts for most books. Fixed Layout eBooks are those with a fixed layout and page size and tend to have background images. For example, a children’s picture book.
The change from MOBI to EPUB files will only affect new uploads and does not require any action for eBooks published prior to June 28, 2021.
Chris The Story Reading Ape's Blog 
I think KDP’s been accepting EPUB files for over a year. I know I did Princelings 10 with it last September, can’t remember what I did with Princelings 9 the year before. Makes it much easier for those of us on Mac 🙂
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