Flying Pawn not moving Up and Down.

I’ve created a blueprint for a flying drone, with 4 sets of inputs; roll, pitch, yaw and thrust(to make it move up and down). The first three controls all work fine. However, the fourth control of thrust doesn’t work and I can’t move up and down. I’ve attached a screenshot of my event graph for movement up and down for reference. Could someone please help me with the required settings?