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making sure to set an ASIN identifier to match the Kindle version of the book
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More than 9 out of 10 of my ebooks have no ASIN
About 20 of my ebooks are not even published. I convert everything to epub. Everyone, including Amazon, uses ePub for publish upload of real ebooks.
The azw3/KF8 is proprietary Amazon only. The epub is documented standard used by almost all, including Amazon for upload to publish. Only Kindle or Kindle apps truly support azw3/kF8. All other eink use epub. All non-Amazon ereader apps use variations of epub or epub directly.
Lithum, Pocketbook and dozens more are better ereader apps than K4PC or Kindle Apps and use epub.