Calibre automatically converts everything though. I'm sure there are some edge cases where the conversion isn't perfect, but how are you managing your Kindle where you'd care that the original file is an epub?
> Update: It looks like Amazon is converting the uploaded EPUB to KF8 (AZW3). So, it looks like they might not support EPUB natively.
The exception is to put the PDF through an OCR process, but this destroys the formatting and can't deal with images. The whole point of my scanning these old books was to keep the historical information.
I have hundreds of old books I have scanned and converted to PDF, but I cant read these on a Kindle.
Plus I've built a dual camera book scanner similar to https://www.diybookscanner.org/
And where necessary I have access to commercial high-speed duplex scanners which do require that the spine be cut. OK for old magazines, etc.