And are you also including the cover itself in the file?
Have you tried this on the Kindle platform? I ask because the most recent book I uploaded wound up with two cover images when converted on the KDP. (This happened to me a year or three ago, but more recently Amazon has been very good about suppressing the included cover.
(I suppose though that if the included cover were suppressed, then the link wouldn't work anyhow! Perhaps that's what happened with iBooks?)
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