I usually download ebooks from Anna’s Archive and transfer it to my Kindle through the service. But 1/10 times it fails, with no apparent reason. The particular ebook in question is https://annas-archive.org/md5/e310a253a9d85992129cc2b8dd351556. What’s the way out?
AFAIK epub is not universally supported and def. not by any kindle.
best dl, run through calibre (convert to mobi/azw) and transfer this via usb to kindle.
best