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.