Many of you have recently received emails from Kindle Direct Publishing (KDP) announcing that Amazon is changing file requirements for KDP ebooks. As often happens with change, there is some confusion about how this will change how authors and publishers will upload their ebooks to KDP leading to questions and concerns.
From https://kdp.amazon.com/en_US/help/topic/G200634390:
“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.”
Chris The Story Reading Ape's Blog 
Reblogged this on wordrefiner.
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I never seem to get these e-mails, either. Thanks for the heads-up, Chris.
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Welcome, Pamela 👍🤗
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I have used .mobi for my Amazon ebooks so this article is very useful. Thank you. 🙂
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Thanks for sharing, this will impact a lot of authors.
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Thanks, Chris. I never seem to get these emails (plenty from other parts of Amazon). But not accepting MOBI won’t affect me, thank goodness.
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Glad you’re not affected, Jemima 🤗
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Many thanks for drawing these changes to my attention, Chris. I always upload in document format (Microsoft Word for Kindle and pdf files for my paperbacks), so I suspect that these changes will not impact on me. It is, however useful to know of them. Indeed I don’t recollect having received an email from Amazon informing me of any such changes. So, had it not been for you sharing, I would not have been aware. Kevin
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