Hello Thank you for your question and reaching out.
I can understand you are having issues related to WD MyCloudEx2,
1: Add Windows Credential for WD My Cloud.
2: Change the Registry Setting.
3: Enable SMB 1.0.
4: Check SMB Settings and Disable SMB 2.0 & 3.0.
5. Disable any Antivirus program or Windows firewall you may have for temporary purpose. Reference : https://answers.microsoft.com/en-us/windows/forum/all/windows-10-file-explorer-cant-see-my-wd-nas-device/fa55f244-4805-48aa-a1f0-bdb39b81dcfb
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