Item Not Added to Inventory

I am using Unreal 4.10 and following the tutorials on the Unreal Engine youtube channel (UMG UI Inventory: Adding Player Input & Testing | 07 | v4.8 Tutorial Series | Unreal Engine - YouTube). I have set it up how he sets it up (I hope), but whenever I pick up an item, it disappears (like it should) but it doesn’t show up in my inventory.