Hi. Usually when I save an ePub to MacOS, a Preview image is automatically generated based on the cover image. This is the image that is shown in the Preview section of the Get Info and appears as the icon in Finder when an icon is not set (the files have no icon other than the system one).
Recently I changed the cover image on one of my books. This ended up being a bit of a trial and error, so I'm sure I broke something along the way. When I saved this updated book to disk, there was no preview image. All I saw in Finder was the generic ePub icon.
I've double-checked the metadata, manifest, cover.html, and image file. They seem to be correct. The cover shows up in the metadata just fine, and when I load the file itself into Books, for example, the cover does show correctly.
Can someone with more experience than I please point me to what correction I might make to get Calibre to properly generate the Preview image when the book is saved (I'm sure Calibre does generate it because it's a variant of the cover, not an exact reproduction of the cover image)
Thanks in advance! Jeff