Amazon even has ePub listed as a supported format now for the Kindle Personal Documents Service, and there’s a note saying the Send-to-Kindle applications will also support ePub starting in late 2022. It gets treated as a typical personal document so there is no cover image, and the file is no longer in ePub format once it reaches a Kindle since Amazon converts it to Kindle format (AZW3).
The ability to send ePubs to Kindles has unofficially been supported for years, but you had to change the file extension to .png before sending. This just makes it easier and removes a step.
So regardless, I suppose it is at least easier now, with no cables or other intermediate steps. Note though that if you use free Calibre software still to convert your ePub book into Amazon's format, it does show the book cover on the Kindle.
See
Kindles Now Support ePubs Sent by Email | The eBook Reader Blog#
technology #
epub #
kindle #
reading #
ebooks 
Here's an interesting detail that just turned up at MobileRead. You can now send ePub ebooks by email to Kindle ereaders and Kindle apps. Amazon even has ePub listed as a supported format now for the Kindle Personal Documents Service, and there's a note saying the Send-to-Kindle applications will also support ePub starting in late
