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The same page clarifies that EPUB, docx, and EPUB creation flows are supported/recommended... and yes, there's HTML and RTF reflowable flows.

• senkora 6y ago
  If you look at the rightmost column, none of those mention EInk ereader support, only app support.
  • mlyle 6y ago
    Sure, but the rightmost column is broken. e.g. It says that KPF/Kindle Create is not supported by EInk readers.