Why can I open a menu on PC but not on Mobile?

Here's code with my explanation, let me know if you run into any issues.

local MenuOpened = false -- I believe a variable might be good for this scenerio.

--[[
Consider using InputBegan, it's widely used and easy to figure out.

If you're wondering...

UserInputType is the type of input recieved (keyboard, mouse, touch).
UserInputState is the state of the input (begin, end, changed).
]]

button.InputBegan:Connect(function(InputObject)
    if InputObject.UserInputType == Enum.UserInputType.MouseButton1 or InputObject.UserInputType == Enum.UserInputType.Touch and InputObject.UserInputState == Enum.UserInputState.Begin then
        MenuOpened = not MenuOpened
        if not main:FindFirstChild("ContinueScreen") or (main:FindFirstChild("ContinueScreen") and main.ContinueScreen.Visible == false) then
            menu.Position = UDim2.new(0,0,0.2,0) -- Not sure why you put this here, this could interfere with the tween, I kept it anyway.
            if MenuOpened == true then
                Sound.Pitch = 1
                button.Title.Text = "Menu <"
                button.Title.DropShadow.Text = button.Title.Text
                char:FindFirstChildWhichIsA("Humanoid").WalkSpeed = 0
                pcall(menu.TweenPosition,menu,UDim2.new(0,0,0.2,0),Enum.EasingDirection.Out,Enum.EasingStyle.Quad,0.25,true)
            else
                Sound.Pitch = 1
                char:FindFirstChildWhichIsA("Humanoid").WalkSpeed = game:GetService("StarterPlayer").CharacterWalkSpeed
                button.Title.Text = "Menu >"
                button.Title.DropShadow.Text = button.Title.Text
                pcall(menu.TweenPosition,menu,UDim2.new(-0.1,0,0.2,0),Enum.EasingDirection.Out,Enum.EasingStyle.Quad,0.25,true)
            end
            pcall(Sound.Play,Sound)
            --[[
            'pcall' is good for preventing errors that are not necessary.
            I use it very often, and I encourage it.

            Here's a good example of it:

            local success,response = pcall(function() return "this is what response will be" end)
            print(success,reponse)
            Output:
            > true,"this is what response will be"
            ]]
        end 
    end
end)

I just changed my original event which had MouseButton1Click into MouseButton1Down. For some reason it fixed everything, found it on some roblox dev forum or something. Thanks for trying to answer my question!