This usually happens when a new user thinks Windows will automatically use the bulk 2TB drive. It never has.
The desktop is a folder in your user home folder which is on drive C which is 250GB or so. You need to start using your 2TB drive now. It's another drive letter and if you want you can place a short to that file on your desktop. Basic Windows and PC skills so write back what step is stopping you from using your 2TB drive.
I have 2 TB storage and a SSD Drive. I just got the computer. I tried to put a large file from a USB to my desktop and received a message saying " There is not enough space on this computer. You need an additional 131 GB to copy the file which is 140 GB. I have hardly put many files on this new computer (desktop) should't it put the new 140 GB on the desktop. At the end of the message it showed "Space Free 8.54 GB and total size as 237 GB". Strange it showed 237 GB when I have 2 TB. Could this be referring to the SSD?
My older computer that ran Win 7 with only 1 TB storage put large files onto the desktop with no problem.