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As I stated, when calibre sends an epub to any device, it attempts to update the cover in the epub. To do this, it needs to find the current cover image and replace it. If it can't find the cover image, or there isn't one, the cover isn't changed or added. This sounds like what you are seeing.
The solution is to add the cover to the book while it is the calibre library. The "Polish Books" function will do this. Select the books, open Polish books and select "Update the cover in the book files" and press OK. This will either replace the existing cover if calibre can identify it, or insert the cover at the start of the book. Once this has been done, the books will go to the device with the correct cover. This can also be done during a conversion or using the "Modify ePub" plugin. Or you can edit the book and add it manually
The alternative is to select the cover sending options in the KoboTouch driver and have it generate and send the covers separately when you send the books.
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