Export PDF version from Reedsy. Reedsy is similar to Medium in that the writing UI looks very similar to the PDF output.
Export ePub version from Reedsy. I've tried all sorts of ePub formatting tools, and this has been my favorite output so far.
Use ePub version to create MOBI in Calibre. Here's the tricky part. For people to read your book on their Kindle, the file needs to be small (less than 10 MB). Initially, I used Amazon's KindleGen, but the outputted file was way too big (50 MB). After that, I tried Calibre, which is way better. When converting ePub to MOBI, it produced a well-formatted file that was 6 MB.