WD MyCloud Gen 2 Won't Recognise WD MyBook 8TB USB

My Cloud OS 3 Personal & Network Attached Storage My Cloud
3

Thank you, will try in a few minutes. I’ve just restored a clean image of Windows 10, and also used the WD Quick Formatter tool mentioned in this thread but still cant find the USB MyBook on the network! Couple of Windows updates downloading and installing atm, will try your suggestion after. Thank you.