Ue4 . Cloth Tools/No Collusion

Hey, I updated my Engine now to 4.17.2

Now i can " Change the Physic Asset" of the Cloth Meshes

but i dont get any Collusion to work,any ideas?

i followed this exactly-> https://docs.unrealengine.com/latest/INT/Engine/Physics/Cloth/Overview/

Hope someone can help me

KS