second NvME drive on Optiplex 7050

Hi, 

I want to expand the storage on my 7050. I bought an additional NvME card because the website said it was compatible. But now I realise there only seems to be one slot and it is already taken by the exising memory. Is it possible to install a second NvME. I don't really want to clone what's on the old card and put it on the new card because the new card doesn't have that much more storage and I'd assumed I'd be able to use both... I know I'm a newb so thank you for any help. 

D