tcasdorph

sorry its taken so long; but is still interested here is my purchase link: https://www.amazon.com/gp/product/B0722N3BQ6/ref=ppx_yo_dt_b_search_asin_image?ie=UTF8&psc=1 there are a couple of other brands with the same product, and the price has come down about $20

if you are referring to M.2 slot, it has to be SATA SSD (vs PcIe)

I had somewhat the same problem, with same device. I have had good success with the 1.04b loader as DS918+, have not been able to do a physical shut down thru DSM or access built-in wifi. I'm using a vSATA M.2 SSD and 1TB hard drive in cage. Also found a bus powered dual-drive enclosure that works with the type C connector, powered USB enclosures work also.