Left mouse down not triggering


This is for my inventory system, which right now, when I click on an eligible slot, the primary/secondary slots, and i have something selected, it SHOULD just remove that item from an array. The main issue isnt with the ending logic its just that the mouse down condition isnt working. None of the events run after it, and I don’t think its a flow issue, because replacing mouse down with something like if 1=1 works, or other conditions that are always true
Does anybody know the issue here