my books do not appear on my adroid ADE

I have Windows 10 and an android (Pixel 3). All my books appear on the PC but not on the adroid. I have tried deauthorizing, uninstalling, but nothing works. On the PC my android device does not show up and I see no way to add it. Even when my phone is connected to my PC by usb cable, it does not register. I have tried manually copying books to the phone and that does not work either. Please help!