The covers and the cover thumbnails of at least some of the "Compatible epubs," such as
Dr. Jekyll and Mr. Hyde, don't display on some old readers (one besides the Nook, mentioned below, is a Sony). I thought the cause was the following error, which Calibre finds when you run a check in the editor:
Quote:
The meta cover tag has content before name [epub/content.opf]
Some e-book readers such as the Nook fail to recognize covers if the content attribute comes before the name attribute. For maximum compatibility move the name attribute before the content attribute.
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The code is
Quote:
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<meta content="cover.jpg" name="cover"/>
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And maybe it is the cause. But if you have Calibre correct just this error, it still doesn't fix the problem. Converting epub ==> epub does, however, do the job.
Link to the book:
https://standardebooks.org/ebooks/ro...d-mr-hyde.epub