What does appear on the devices as the cover?
As a general rule, the Kobo devices use the first page of the book as the cover. If you open the book on the device and the cover should match the first page. It is different for kepubs.
For epubs, calibre attempts to update the cover in the book as it is sent. This only works if calibre can work out what the cover image is. If you have set the cover in the library, but have not done a conversion or use Polish books to update the actual book, this might be the problem.
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