How to make a drag and dropping system for a custom inventory? [SOLVED]

Solution:

spawn(function ()

    local InventorySlots = script.Parent.Parent.Parent:GetChildren()

    for _, slot in pairs (InventorySlots) do

        if slot.ClassName == "Frame" then

            slot.Detector.MouseEnter:Connect(function ()

                SlotToInsert = string.sub(slot.name, 5, -1)

            end)

        end

    end

end)

I've added this piece of code above to connect a function to any inventory slot that changes the current slot ID to the slot ID of the inventory slot when the mouse touches the slot

I've created a custom GUI inventory for my game. Now I want to create a drag and drop system for it. I have already set up a server script that can replace the slot values of two specified slots. The only problem is that I do not know how to do the actual drag and drop. Basically I would like to know, how I can create a system that if I drag an Image Button on another ImageButton and drop it returns the 2 SlotIDs of the 2 Images Buttons

This is how the Inventory GUI is set up:

ScreenGUI
  Inventory Frame
      Slot List
          Slot (1-27)
              Image
              SlotID

My attempt:

script.Parent.MouseButton1Down:Connect(function ()

    local Mouse = game.Players.LocalPlayer:GetMouse()

    Dragging = true

    script.Parent.Parent.Description.Visible = false

    FireFunction = false

    while Dragging == true do

        script.Parent.Parent.Parent.Parent.Parent.DragAndDropImage.Image = script.Parent.Parent.ItemImage.Image

        wait ()

        local mouseLocation = (UserInputService:GetMouseLocation())

        script.Parent.Parent.Parent.Parent.Parent.DragAndDropImage.Visible = true

        script.Parent.Parent.Parent.Parent.Parent.DragAndDropImage.Position = UDim2.new(0, mouseLocation.x - 40, 0, mouseLocation.y - 70)

        script.Parent.Parent.ItemImage.Visible = false

        if (UserInputService:IsMouseButtonPressed (0)) == false then

            print (UserInputService:GetMouseLocation())

            Dragging = false

            script.Parent.Parent.Parent.Parent.Parent.DragAndDropImage.Visible = false

            script.Parent.Parent.ItemImage.Visible = true

end

end

end)

This attemt works perfectly except for returning the slot IDs