I bought a book in another store "The Pragmatic Bookshelf" and I want to deliver the content to my Kindle as a Book. When I send to it, it is recognized as Document. Is there a way to do that?
I send the book to the email I set up on Amazon.
Documents and Books are treated almost identically inside the Kindle app or Kindle device. There are filtering functions to divide the view so you see only one type or another type, but generally you can see both types together.
One thing: in Manage Content & Devices, (on the Amazon website) you need to specify Documents or Books, so you can see files you have uploaded or files which were bought.