Hi I had some issues figuring out an easy to around to read my text books on my new kindle. But after a little research I found a super simple solution. Just download the book as an epub and convert it to a mobi file. The kindle recognizes mobi files and let's you read the book in the books app. It even does the text to speech.
Here's how to do this....
Download the epub book file on your computer.
Go to https://www.epubconverter.com/epub-to-mobi-converter/ and convert the epub to a mobi file.
Plug your kindle in to your computer and transfer the mobi file or your book to your kindle.
Open the books app on your kindle and ta da there's your book.