How can I get my Mac to see and transfer files from my android phone?

When I hook up a USB cable from my Mac to my Samsung Galaxy phone I get a notice that says "Can't access device storage" "Make sure your device is unlocked and that File transfer or MTP mode is selected" How do I find "MTP mode"? How do I find "Unlock"?


Android devices require a driver/app install - they will not natively hook up to a Mac.

Google provides Android File Transfer for this task.