I don’t need to look through all of this, knowing what I do on how to do it.
On your spawnable actor, make a “Quantity” integer variable. Then make it public and “Expose on spawn” (Click the variable and select these in the details window)
Now, when you hook that class into spawn actor, it should grant you a pin to input an amount (integer) to set that variable to. Now you have an AMOUNT for use with the rest of your UI!