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Alan, I upload the identical epub to the KDP. (I buy a copy as soon as the book goes lives, just in case the double-cover problem arises, as it occasionally does.)
I've never experienced a failure, and believe me, I check. I always buy the book, and if I revise it, I ask for the new version to be "pushed" to my Kindle archives. Though I work in epub, I consider the "mobi" the more important format, since Amazon sells 85-90 percent of my books, up from 80 percent a few years ago.
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