Can't access storage and sd card of Moto G4 when connected with USB to computer and in MTP mode I have a Motorola Moto G4, marshmallow 6.0.1. When I connect it to my computer via a USB cable, it charges, and the computer detects the device, but I cannot see the contents of it, namely of the sd card inside. I also changed the USB mode to File transfer (MTP).

I have contacted Motorola already and I tried everything they told me to do (USB debugging option, etc.), but to no avail. They said that there might be a problem with the computer, but I've used this computer already for this operation (but on other phones) before.

I have confirmed that it works on other computers, so I am also pushed to believe that it is the computer's fault. I also installed every driver from Motorola's website.

I deleted the cache already and performed every suggestion in a similar thread, still not working.

Any help would be appreciated. Thank you.
You might be on an outdated version of ANDROID> 6.0/ 6.1
If so, UPDATE your android and the problem should be fixed.