Bought Delphi's Zola from Kobo, with a discount coupon

As for Amazon, you can go to Manage Your Kindle and turn on Automatic Update, if you haven't already.
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Opt in for automatic book updates to receive new versions of your books when we have confirmed that improvements were made. In order to retain your notes, highlights, bookmarks and furthest reading locations, ensure that all your Kindle devices and reading apps have the "Annotation Back Up" setting turned on
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