I need to sincronize my Windows Phone 950 Xl with WDMycloud

You will have to find a third party Windows Phone Sync app that allows for local network access to a network attached storage device like the My Cloud.

WD discontinued the WD2Go app for Windows Phone over a year ago and have NO plans to reintroduce it.

https://community.wd.com/t/windows-mobile-app-for-mycloud/97249/40