Does Optiplex 7050 SFF Support additional SSD in PCIe slot?

I am trying to install a second M.2 SSD via the x4 or x16 PCIe slot. It is not seen by the OS. When I look in the BIOS config under System Information, it shows "Mass Storage" for the slot, so it is being detected by the system at least to some extent. However if I go to Drives under System Configuration, only the drive for the M.2 slot is shown as well as the SATA ports. Ideally I was hoping to use two M.2 SSDs on the same card if bifurcation is supported (separate question), but at this point I really just need a yes or no answer on whether an SSD is supported in the PCIe slots or only in the existing M.2 slot.