Perhaps you should read @haydnfan's message? Pay special attention to the line that read:
Quote:
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If you have to convert them in Calibre, when you're at it select the personal document setting.
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As has been noted in multiple discussions, books sent with the cdetype PDOC work better than books sent with the cdetype set to EBOK since Amazon basically doesn't touch PDOCs. See the attached image for where to select that option.