I have already upgraded my Surface Pro 3 from 256gb to 1tb. A friend cloned the drive presumably using a caddie to interface each drive to another computer. I now have a Surface Pro 4 with a 256gb NVMe SSD which I would like to upgrade to 1tb. The trouble is I cannot find a caddy for an NVMe drive. If anyone has done this then an idiots guide would be much appreciated as my computer knowledge is still back in the days of valve computers.