If the My Cloud does not show up under Computer in Windows File Explorer see the following thread, Compilation of Windows 10 Methods, Steps and Solutions, below for a list of potential workarounds. Microsoft introduced a bug in their November update to Windows 10 that causes problems accessing any NAS device like the My Cloud that uses Samba.
https://community.wd.com/t/compilation-of-windows-10-methods-steps-and-solutions/142576
