I was also having connecting a moto g phone to my windows pc.
I found allaboutmotog . com/moto-g-how-to-guide/how-to-connect-moto-g-with-pc-through-usb-cable-for-moto-e-and-moto-x-as-well/
which led me to the settings > storage and then the "vertical pipe"/settings icon in the top right hand...