title_body: Attempting to create an ebook for sale on kindle
upvoted_answer: If you upload valid epub2/epub3 books to Kindle KDP, Amazon will automatically convert them to KFX books with enhanced typesetting, if the device/app supports enhanced typesetting.
  
  In order to preview enhanced typesetting features, you'll need to install Kindle Previewer 3. 
  
  Once you've installed the previewer, you can also install the KFX Output Calibre plugin and generate KFX files that you can sideload to Kindles and Kindle apps.
  
  For more information on enhanced typesetting features also see Appendix A of the Kindle Publishing Guidelines.