One of the ways to show the cover is the epub -> epub conversion, but I prefer to use Sigil for this.
On Sigil, open the epub and make sure the cover is properly set. Next right click on the image in the Book Browser and, under "Add Semantics", choose Cover Image if it is not already checked. If it is checked, deselect it and select it again (this adds the meta element defining the cover to the OPF). Save the epub and exit Sigil.
|