There are numerous prior threads that discuss the syncing between the my cloud and multiple computers. For some the syncing works from a single Share on the My Cloud to multiple computers, for other it doesn’t. See my response to another poster on this very question from a month or two ago:
https://community.wd.com/t/wd-mycloud-sync-issues-between-2-computers-and-cloud/159292/2
More than a few have stopped using WD Sync all together and instead use third party sync software. One popular free program is Free File Sync: http://www.freefilesync.org/
