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Originally Posted by mumdigau
What do you mean by 'properly identify'? And how do I check if a epub file is OK on behalf of this?
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Until this version the only way to add a new cover was by converting the file, even epub to epub sufficed. As of this version ebook-meta can change the cover if it is already properly labeled as a cover inside the book. You can open a epub in Sigil, right click on the titlepage then go down to Add Semantics, if cover is checked then this was properly set.
I believe this means that if the cover is not properly set then the only way in calibre to add the cover is to convert the file.