Sincronization Phone <> MyCloud Doubt

So this might me a basic question any how I have the doubt since haven’t found the answer for it…
I have mycloud NAS which works great
But here it goes…
Whenever I erase something from my phone or device will it erase from mycloud too? Since I haven’t seen that effect when I erase someonething from my phone. Please advise since I had the idea tha this is how it should have worked.

WD Sync is a desktop app at the time of this post. Deleting files from iOS/Android devices will not automatically delete content from your WD My Cloud in order to match the mobile device’s content.

Thnx Trancer…