Like I said, you have to actually insert the cover.jpg into the epub archive - which requires actually opening the epub archive with an archiver (or a file manager that can handle it - would have to temporarily rename it to .zip instead of .epub, though) OR doing an epub-to-epub conversion within calibre (just adding a new cover through the metadata editor doesn't do anything useful; you'd have to do it this way if the file has no interior cover already)
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