Help: Need very simple inventory system

Hi,
I need help with my inventory system. I got to make a simple inventory system that makes an array of 3 items with a UMG. I used this tutorial Unreal Engine 4 Basic Inventory / UMG Part #1 - YouTube to make the inventory. Instead of copying the multiple inventory slots I just adjusted it to 3.

Now that I got that out of the way. My main problem is that I want to know how to remove an item from the inventory slot it was in. I want to be able to remove the item when I collide with a trigger that was set on a door.

Remove it from your inventory array and update your umg.

Assuming your inventory is an array and you have a function to update the umg.