Not sure what CPL link is. Generally one should use one network connection (either Ethernet or WiFi), not both at the same time. Using both can have issues under certain network configurations.
Other troubleshooting steps. Ensure all devices (My Cloud and computers) have the same Workgroup name. Ensure all devices are on the same IP address subnet. Example all devices have an IP address in the 192.168.1.x range. Assign a static or fixed IP address to the My Cloud either using the router’s administration interface or within the My Cloud Dashboard > Setting > Network section. Check the router settings to ensure the router isn’t filtering or blocking access between network clients (sometimes called Client Isolation). Or that the router isn’t using some kind of additional security/antivirus filtering that would affect network clients. Disable any third party anti virus or security software on the Windows Computer (this includes Malwarebytes, Norton/McAfee/Avast or other antivirus/malware prevention programs).
Point is, some setting somewhere on your network or more likely on the Windows Computer itself appears to be preventing your computer from properly accessing the My Cloud.
Access the My Cloud by it’s IP address in Windows File Explorer. Example
\\192.168.1.100 and then right click on a Share, from the listing of Shares, and select Map Network Drive to start the drive mapping process (as indicated in a previous post link on how to map a Share).
Example mapping of a Share via IP address (through Windows File Explorer):