The upcoming update for the Kindle will bring this new support for the feature, and users will be able to open ePub files directly instead of the manual conversion done online.

Microsoft brings back EPUB support in Edge Canary. The feature lets users open and read EPUB documents directly on Microsoft Edge. It doesn't sport the same experience as the proprietary engine ...

Initially released in 2007, ePub or Electronic Publication is an open e-book format that is easily accessible on e-readers, tablets, phones, and more.

Instead, per an update to Send to Kindle documentation, the Amazon Kindle will soon support using the Send to Kindle function to convert ePub files into an Amazon-specific digital book file format.