ssd for wwan slot - WWAN Slot 888 casino slot machine

These models may be able to accept a mini-PCIe SSD in the WWAN slot: (need confirmation).

Even assuming your WWAN slot supported SATA, then ideally you'd get a native M.2 SATA SSD so you didn't need an adapter, but if you already had an mSATA SSD you wanted to use, then you'd need an adapter that went the opposite direction, i.e.

Anyone have any success adding a second SSD? The slot in question is marked as HSA and is meant for use with a WWAN card.