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My Cloud OS 3 Personal & Network Attached Storage My Cloud
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If you’re trying to see it via UPnP/DLNA, you might find some pointers here:

http://community.wd.com/t5/WD-My-Cloud/FAQ-Twonky-DLNA-Media-Server-Setup-amp-Use/td-p/858810

Check your shares have media serving enabled, then check media streaming is enabled. Both settings must be on to get the Twonky media server to work.