Aurora R16 Max SSD storage

Hi,

I just bought an Alienware R16 (i9-14900KF model), with a 2TB SSD. I'd like to buy another SSD, but looking at the specs, it says the SSD max capacity is 4TB. Is the 4TB limit is for total capacity, or per slot? In other words, can I add another 4TB SSD?

Thanks.