DLNA on external USB storage (usb 2 on WDMyCloud) possible?

My Cloud OS 3 Personal & Network Attached Storage My Cloud
4

By default, the Twonky DLNA server only looks at /Public. I’m not sure that the USB drive appears under /Public. So you may need to go into Twonky UI Sharing page and add the USB drive.

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