How to make LocalPlayer chat and bypass FE?

I am making an custom chat ui and it has this in a LocalScript

local m = game.Players.LocalPlayer:GetMouse()
m.KeyDown:connect(function(k)
    if k == '/' then
        game.Players.LocalPlayer.PlayerGui.ChatUI.Frame.Frame.TextBox:CaptureFocus()
        game.Players.LocalPlayer.PlayerGui.ChatUI.Frame.Frame.TextBox.typing.Value = true
    elseif k == '\r' or k == '\n' then
        if game.Players.LocalPlayer.PlayerGui.ChatUI.Frame.Frame.TextBox.typing.Value == true then
            game.Players.LocalPlayer:Chat(game.Players.LocalPlayer.PlayerGui.ChatUI.Frame.Frame.TextBox.Text) -- This line doesn't work
            game.Players.LocalPlayer.PlayerGui.ChatUI.Frame.Frame.TextBox.typing.Value = false
            game.Players.LocalPlayer.PlayerGui.ChatUI.Frame.Frame.TextBox.Text = "Click here or press '/' to chat"
        end
    end
end)

Now... how do I make the game.Players.LocalPlayer:Chat() work?

In an normal Script I have:

local chatstorage = game.Workspace.ChatStorage

game.Players.PlayerAdded:connect(function(plr)
    plr.Chatted:connect(function(msg)
        local chat = Instance.new('Folder', chatstorage)

        local msgVal = Instance.new('StringValue', chat)
        msgVal.Name = 'Message'
        msgVal.Value = plr.Name..': '..msg

        local colVal = Instance.new('Color3Value', chat)
        colVal.Name = 'Color'
        colVal.Value = Color3.new(math.random(255)/255,math.random(255)/255,math.random(255)/255)
    end)
end)

but it won't fire the plr.Chatted when I use the game.Players.LocalPlayer:Chat() in a LocalScript. How to fix this?