Which difference between "WD Access" and "WD Sync"?

I have a WD EX2 and I’d like to know the difference between “WD Access” and “WD Sync” on MacOS. Which one should I use ? They seems to have the same function…

Hello,

WD Access, is a utility that will discover your WD Cloud device on your network and provide you tools for uploading files, access to the WD Cloud dashboard and other shortcut features.

WD Sync, Allows you to synchronize your files on your computer to the WD network drive that you are using.

OK.

And WD Access seems to work better to copy files. It’s a different method ?

WD Acces doesn’t sync automatically like WD Sync ? It’s just make a copy when asking ?