Can't send books to new Kindle Fire
I am trying to load ebooks to a new Kindle fire. When I right click the book and select send to device the selection criteria are greyed out and the kindle fire is connected via usb and recognized by my computer. I used to be able to hook a kindle up and select the ebooks and then send to device. I can longer can do this.
Calibre version 2.73
Windows 10 OS