my Motorola Moto C Plus, and my android system is nougat 7 does not recognize USB device on android studio and I even googled it I downloaded Motorola USB driver even enable developer options USB debugging is on as well please help besides that I have read many forums I did find not a solution for my issue .
Use The Android File transfer application on Mac for MacBook to show your android device, Check again the USB debugging is on or not .