I sent several EPUB books to my Kindle (via Calibre). One was delivered just fine; the other was not delivered. I received an error email from Amazon telling me that I needed to use an acceptable format (EPUB, MOBI, etc.). Again, the book was in EPUB. So I used the Modify EPUB plugin to make the UTF-8 correction (just in case) and sent the book again. Same result. Any idea why this one particular book can't be successfully sent to my Kindle when it is in EPUB?
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