Unreal Engine Flex 4.19 Cloth Simulation - pillow

I am using Unreal Engine 4.19 with Flex. It is supposed to be able to do cloth simulation and I am trying to make a pillow that reacts to collisions. I have a static mesh for the pillow and I have converted it to a Flex asset. I selected cloth simulation and inflatable. I was expecting some kind of mesh deformation on collision with my character but there is nothing. Is what I am trying to do possible?