Player won't carry out animation?

I was trying to do a crouch animation for my game. This LocalScript was in StarterCharacterScripts and a child which was an animation called "Animation". The output doesn't show any errors but the player doesn't carry out the animation. Here's the script:

local UserInput = game:GetService("UserInputService")
local humanoid = script.Parent:WaitForChild("Humanoid")
local Animation = humanoid:LoadAnimation(script.Animation)
local Running = false

UserInput.InputBegan:Connect(function(key)
	if key.KeyCode == Enum.KeyCode.C  then
		if not Running then
			Running = true
			Animation:Play()
			humanoid.WalkSpeed = 10
		else
			Animation:Stop()
			Running = false
			humanoid.WalkSpeed = 16
		end
	end
end)

Is your animation's AnimationPriority higher than Core? You can set this in the script with

Animation.Priority = Enum.AnimationPriority.Action