Thank you for the plugin. I've successfully converted a book from epub to kfx in calibre, and it opens fine in Kindle Previewer, but I can't seem to transfer it to the Kindle app for iOS. When I try to export the file from Dropbox to Kindle, I get an error that says "incompatible document type" and "the document you tried to send is not of a compatible format." I get the same error when trying from the calibre companion app. I'm using version 6.16 of the Kindle Reader app. I was under the impression that kfx is a compatible format for the Kindle Reader for iOS. Any suggestions? Thank you!
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