If you have the Read metadata from file contents rather than the file name setting unchecked (ie get metadata from file name) then calibre will not extract the cover. I think it's been that way since I started using calibre 3 years or more since.
I've often wondered why there wasn't an option to always extract the cover from the format given there's no way of putting the cover image in the file name
Not sure if its been said - the extract from format is available in bulk, if you mark the books you add then as long as the marks remain, you can show all marked books, and apply the extract cover to them in bulk.
BR
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