The cover, cover.jpg, was included in a separate Amazon-specific step, separate from the epub upload.
I did try to identify semantically the cover. In Sigil, I right clicked on cover.xhtml, selected add semantics, then selected cover. It did not work.
Sigil does allow me to specify cover.jpg as 'cover image.' I tried deleteing cover.xhtml and specifiying cover.jpg as cover, but it threw a "Warning OPF resource in manifest not reachable" error with the FlightCrew plug in. It's possible the epub would have worked on Amazon in spite of the error.
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