Trying to create a stackable feature for my inventory system

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1

Hello, im trying to implement a stack size to my items so the user has to have inventory management. My current way doesn’t work as I wanted as it only stacks once and then adds items separately to a different slot but the image doesn’t show up.
current code:

local function AddItem(UI, item, amt)
	local itemType = ItemModule[item.Name]["Type"]
	for counter = 1,invsize do
		local slot = UI:WaitForChild("Slot"..counter)
		local itemAmt = GetItemAmt(playerInventory[itemType], slot)
		if not playerInventory[itemType]["Slot"..counter] then continue end
		if not (GetItemAmt(playerInventory[itemType], slot) > ItemModule[item.Name]["StackSize"]) == false then continue end
		if playerInventory[itemType]["Slot"..counter][item.Name] == GetItemAmt(playerInventory[itemType], slot) then --doesn't work
			print("adding item")
			slot.Icon.Image = ItemModule[item.Name]["Image"]
			if itemAmt == 1 then
				slot.Amount.Text = ""
			else
				slot.Amount.Text = itemAmt
			end
			itemClicked(slot)
			break
		end
	end
end

Can anyone help?