My Cloud READ ONLY on Windows 10

First, have you accessed the My Cloud Dashboard user interface and ensured the User account you are using to access the My Cloud has Full Access to the Share (I assume the Share is configured as a Private Share) that your trying to access? One of the User permission settings when setting a Share to Private is Read Only access.

Second, you may want to read through the Compilation of Windows 10 Methods, Steps and Solutions thread tacked at the top of this subforum to see if there is anything in there that may affect or solve your issue. Windows 10 has problems in certain instances with the My Cloud, most of those problems are caused by Microsoft Windows 10 operating system and not necessarily the WD MY Cloud device.