Why is my R6 FPS arms not working (R6 is enabled)?

local player = game.Players.LocalPlayer

local char = player.Character

local arms = game:GetService("ReplicatedStorage").Arms:Clone()

local camera = workspace.Camera

arms.PrimaryPart = arms.HumanoidRootPart
   
game:GetService("RunService").RenderStepped:Connect(function()
	 arms:SetPrimaryPartCFrame(camera.CFrame + Vector3.new(2, 0, 0))
end)

This is my arms model : https://web.roblox.com/library/5174779349/Arms

Please can someone check my script and arms so I know if they're are correct. If not, could someone suggest something?

Thanks.