Aurora R16, maximum NVMe SSD?

Oh. Wait, what? I am bad at hardware (I have an Aurora R16 but I´m a content creator, not a gamer) and have been bashing my brains. I want to upgrade but keep putting it off bc I´m afraid I will do something wrong.. I have 1TB SSD installed. Dell sales support just told me max SSD i can have total is 4tb. so that´s not true? That would be great news. For now, basically the best I can do, I was told, is to replace my 1TB and buy 2 2TB SSDs.
I had been wanting to start off by buying a second ssd with 4TB (giving me 5 total), and then in the future switch out the 1TB to 4TB as well. Is that feasible or am I way off?
Desperately seeking best way forward! Thanks

Re:  told me max SSD i can have total is 4tb

that is max coming from Dell oem.  no max to your own third party ssd.

To update you all, my R16 came with 2 x 4TB SSDs factory installed, but I need something bigger for one of them, hence the question... After getting the "by the books" answer from Alienware and Dell support, I decided to take a chance on a WD Black 8TB SN850X, which I was able to get at a pretty good price from Amazon. It arrived today. It's installed. I didn't have to do ANYTHING special, and not only is it working nicely, it's also 10-20% faster (depending on operations) than the Dell/Alienware-supplied 4TB device.

... so ... don't listen to Dell/Alienware when they say the maximum device limit is 4TB.

@CluelesslyFrustrated​ The Dell/Alienware quoted limit is 4TB per device/NVMe slot... so a total of 8TB if both slots are used. That happens to be the biggest configuration they sell. As I've just found out though (and as @redxps630 has previously said), that is not the actual limit of the system.