What phone (Android or iOS) are you using?
Would you want to “mirror” or sync the phone’s media contents locally over the local network or remotely?
Edit to add: Also, do a subforum search for Sonos as others have had issues with that device and the My Cloud.
Also see the following unofficial Twonky FAQ thread for possible additional information.
https://community.wd.com/t/faq-twonky-dlna-media-server-setup-use/95373
