That’s the way it works: thumbnails for personal documents are generated on-device (if the content is properly formatted and has a cover image). For all the books in Amazon store, thumbnails can be downloaded even if the content itself is not downloaded. If you download purchased content, it might also generate on device, and that is certainly also true if you download the content for transfer via USB cable.
Personal documents are not guaranteed to have cover images in them (they could be PDFs or a kindle format that was generated without a cover image). And there might be legal issues in doing so.
Last edited by tomsem; 02-11-2022 at 02:14 AM.
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