Possibly Bricked? I'm an idiot.
I believe I may have bricked my Fire HD 7". I decided to flash a new ROM. Something I've done many many times. However, this time I decided to wipe the SD card because I wanted to get rid of all the app folders, my documents, music, etc. and start from a clean state. The problem is that it occurred to me half a second after the wipe that the ROM zip as well as the backup were on the internal SD.
So now I'm in TWRP trying to mount the device, but Windows (8.1) will not recognize the internal storage and mount it as a drive. I have the latest drivers installed but nothing...
It seems I have no way of getting a new ROM onto the internal SD card so that I can flash as normal. Help?