One of my main workflows is converting Substack newsletter emails to MOBI/send-to-kindle via a procmail filter. With the MOBI format files, they all have a nice cover thumbnail pulled from the image in the newsletter. When I switch to EPUB, there are no covers. These aren't books that compete with anything that Amazon is selling -- it's just an email that I prefer to read on Kindle. Sounds like I'll be stuck unless Amazon decides to change how it processes incoming EPUBs? There isn't any technical reason why EPUBs and MOBIs should be treated differently in this respect, is there?
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