I have a Fideco dual drive dock with USB 3 and an SD reader. My PC finds and accesses the drives OK, but doesn't seem to find the SD reader. How do I make that work?

Running 21H1, Build 19043.1165

I think it's this dock (but if you click "User Manual" is just returns "No data":

usb 3.0 all in one hdd docking,All in one usb 3.0 hdd docking,All in one usb 3.0 2 bay hdd docking-Huidegui (fideco.net)