Is it possible to restore the original cover to an eBook after changing it to a downloaded cover or a generated cover in Calibre?
The only solutions I've found so far are to manually open up the epub and pull out its cover.jpg file (when one is available), or to delete the book from the Calibre library and re-add it, which requires re-entering its metadata again.
I feel like I'm either overlooking something or the feature doesn't exist. And if it doesn't exist, may I suggest that it be added in a future version?