Multiple NVMEs on PCIe x16 adapter

Hey guys I waPlotting using a single terabyte NVME on a PCIe x16 adapter And everything was working fine. The adapter has four slots available so I added an additional 1tb NVME and now windows is only recognizing one of the drives. (Oddly enough it’s recognizing the new one) motherboard is an Asus X 58 sabertooth.
Is there something I need to adjust in bios in order for the OS to see both drives at the same time? Any insight on this would be greatly appreciated! Thanks!

You need to enable PCI-E Bifurcation in the bios so the slot will be used as 4x/4x/4x/4x instead of 16x

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