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Hmmm, so maybe the cover image is too large? I've noticed most cover images are 500 pixels wide by 767 pixels tall so before editing the metadata for the ebook I shrink any image to that dimensions and save it and it shows up fine.
Once you've edited/resized the cover image, open Calibre and right click the ebook and EDIT METADATA then SINGULARLY.
Here you'll see the cover image that's in your book, if you copy the image (usually I do it from my graphics program) and then right click the image in the EDIT METADATA window and then PASTE, then click OK it then updates the cover correctly in the ebook.
You can then verify this by right clicking on the ebook and EDIT BOOK and on the left under the FILES BROWSER if you scroll down you should see under the IMAGES section COVER.JPG and it's got an icon next to it. If you see this then it should be okay (providing you sized the image correctly).
I usually convert the ebooks to MOBI and drag them into my Kindle and the covers then appear fine there. Not tried in EPUB format.
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