[leday]

Using Calibre to explode the epub file structure AFTER I had saved the file using Sigil AND reconverted it epub-epub using Calibre yields the following:

A folder entitled META-INF
A folder entitled OEBPS (within this are 2 folders titled Images and Text)
. content.opf
. cover.jpeg
. cover.jpg
. mimetype
. stylesheet.css
. titlepage.xhtml
. toc.ncx

Calibre seems to generate this exact structure on all of the Sigil-saved epubs and this structure seems to be what I need to have this work. It has every time.

Note that I have 2 copies of the cover art (one jpeg and one jpg). Calibre generated the jpeg file but I had to place the jpg one in manually (I also placed both copies in the Images folder located within the OEBPS folder, just in case. It might be overkill, but...).

With this file structure, AND the copies of the images AND the TWO "cover-ID" lines added to the content.opf file, and then rebuilding the epub using Calibre, the covers show up every single time for me. Hope this makes sense.

(I tried to capture a screen shot, but I couldn't figure out how to do this...sorry)