Can't change book covers
I've been trying to add some book covers, and it seems to work until I add the books to my device. In the library the book covers I add are still visible, but when I look at my device (on the computer and the device itself) the picture changes into a tiny picture surrounded by black. Am I doing something wrong? I've tried adding covers mannually and also let Calibre search for covers, but one of it seems to be working.
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