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As I understood the Amazon cover update (as well as Smashwords), the large file was to be used as your display cover (displayed on your Amazon/Kindle product page) and uploaded through your dashboard at KDP. For the actual cover of your book, I believe the specs have not changed (and I add that cover through the metadata file). I use now 800x 1280 (a ratio of 1.6 as Amazon specifies) and try to keep the file size down below 1mg. For internal images I think the max image size is 250kb but I could be in error here.
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