I never include a cover in an epub, because that can (but not always) result in there being two covers, both in the downloaded book and the Look Inside sample. The first is Amazon's conversion from the separately uploaded product image, and it fills the screen. The second is my included cover, and it does not fill the screen.
I never experienced this when uploading html files to the DTP/KDP. Indeed, Amazon would not only suppress an included cover, but also a frontispiece is there was one. So I learned to move the "frontispiece" to follow the table of contents.
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