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Thanks for that. It isn't a plug-in, but I did a bit of experimentation today and it seems the preview was created by Pages, the app that I used to create the original ePub. This leads me to believe that the original ePub file is still used by Calibre and for certain changes, Calibre simply updates the contents of the original file and reuses it. Changing the cover (or something else I did) was a 'breaking change' so Calibre generated an entirely new file that did not have the preview. Can you, or someone, confirm or deny this behavior?
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