Particle GameObject refuses to drag into Prefab?

Hello everyone!!! i have 14 negative feedback because i read an html error! oops!

1.Create particle system
2.Create new prefab
3.Drag particlesystem into new prefab

Doesnt work!!! drag cursor shows “access barred”

WHY??? i have been 3 days not knowing, no one answered me!!! :frowning:

Bump! sniffle.