[Q] Uh-Oh, TWRP not allowing me to mount via USB topic

paypal to who can help me solve this

Here's the deal people,

My GNex was slowing down and acting all funny with stock 4.3 after about 6 months

I finally decided to try out a 4.4.2 ROM

I had TWRP on the phone so I said I'd just copy the Zip to the root folder along with the Gapps

Long story short, I accidentally wiped the storage.
Then I said no biggie, and figured that I'd just mount the USB to my laptop and transfer the Zip file of the ROM I wanted over to the storage.

BUT when ever I tap on mount USB nothing shows up in the devices.

Now I have nothing to transfer the files to.

I have windows 8 on the computer I'm currently using if that matters.

Forgive me people. I am not an avid flasher like I was when windows phone 6 was still around. So spare the insults . Just need my phone running so I can contact my loved ones