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If the metadata contains an Amazon or mobi-ASIN identifier that belongs to a valid KINDLE version of the book, then the cover is shown on the device. The problem is that the "Prefer the Kindle edition" setting is not very reliable. For some books, it just won't fetch the Kindle version of the metadata, while for others, it might work if the ISBN is removed or maybe if the existing Amazon identifier is removed. In some cases, I could only get it to work if the "amazon:" key was present, but the value was removed.
Obviously, this sort of experimentation isn't scalable for a library of hundreds of books. I wish there was a way to quickly fetch and update the Kindle version ASINs for the books in bulk.
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