How do I check if an item is in the player inventory?

Hello,

I am building a 4 person co-op shooter. I am trying to make a quest notification go off as soon as the player picks up a quest item. I've tried many ways and got so many errors, this is giving me a head ache. 

example of what i want

Player follows marker to quest item > player picks up quest item > event checks if item is in inventory> if true (Play quest update) > else do nothing

This is how I do it. player hits “f” to interact with quest actor with sphere trace. Player has reference to item set by this. Uses reference to call custom event on the quest actor. Quest actor fires off some replicated functions that are on the game state. game state updates all players on what the mission is.

From the look of your images it looks like you are trying to do this in the level blueprint. I feel this would be done more easily in the game state