News How to Use a Tablet as a Portable Raspberry Pi Screen

I followed the instructions. I am using a nexus 7 as well. When I plug the micro-hdmi into the raspberry pi and then the hdmi into the adapter then plug the usb c with a microusb adapter into my nexus......the USB camera program doesn't see it. (no UVC device) What am I doing wrong?
 
Any way to get the touchscreen of the tablet to be workable? I plugged in a tablet to a PI w/o a keyboard or mouse (I usually ssh to it) .. I get the desktop, but I don't know how to interact with it w/o getting a physical keyboard or mouse .. any tips?