(Using 2017.3) I create an empty, add a Cloth component, then assign Plane to the skinned mesh renderer. But I can't scale the plane. The scale tool (and all the others) won't toggle on. Edit bounds won't allow anything to move. Values in Bounds boxes can't be changed. Scaling the transform makes it look smaller, but constraints grid is still 5x5. ???
UPDATE: Found a way to get it working. I created another empty "cloth-root" and assigned it to the Root Bone slot of the Skinned Mesh Renderer. I can change the position/rotation/scale of the Root Bone and everything else seems to work as in the lesson. Must be a recent change...