How to retain collected notes/diary?

I’m sure this has probably been asked before, but I have spent two days searching for a solution and only found parts, I am very new to UE4 and with my limited knowledge have not been able to expand upon what I’ve found.
As the title suggests I require a process for picking up notes/letters/diaries in my game, This much I can find out how to do, BUT what I can’t find is a way to KEEP those notes so you can refer back to them later.

Example: In your apartment, you pick up a grocery list. It is displayed in the middle of the screen, you read it and click it away.

Later you are in a supermarket, you press (For example) “J” and it brings up the collection of letters /notes you have collected throughout the game and you can scroll through them until you find your grocery list, which is once again displayed in the middle of the screen for you to read until you click it away.

Does that make sense?