Originally Posted by GeoffR
Customise the KoboTouch plugin in Calibre (Preferences --> Plugins --> Device interface plugins --> KoboTouch) and tick the "Upload covers for books" and "Upload Black and White Covers" boxes.
Note that the sent covers will be stretched to 3:4 ratio unless you also tick "Keep cover aspect ratio". Kepubs from Kobo seem to keep the original aspect ratio.
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