Using single animations?

I am trying to make an NPC that has a typing animation. No, I am not making a custom animations-type thing. I want to make the animation loop, when the game starts. Just a single animation. I looked over the wiki and couldnt find anything (yes, I tried the Animations section. Didnt work). The animation is: https://www.roblox.com/typing-item?id=420291785 . I cannot seem to find the issue. Do I need a script to start it, or where would I put the animation?

I am assuming here that your NPC is pretty close to a player, is in workspace, and has a humanoid. I think this may work :D

NPC = workspace.NPC
repeat wait() until NPC ~= nil
local human = NPC:WaitForChild("Humanoid")
local anim = Instance.new("Animation")
anim.AnimationId = "http://www.roblox.com/Asset?ID=420291785"
local animControl = Instance.new("AnimationController")
local animTrack = animControl:LoadAnimation(anim)

while true do
	animTrack:Play()
	wait(animTrack.Length)
end

I made this quick little thing, hope this works. Place this script in the NPC and place the animation in the script like for example "NPC.Script.Animation"

	function PlayAnimation()
		
	local Humanoid = script.Parent:WaitForChild('Humanoid') -- Waits for humanoid in the NPC
	local Animation = Humanoid:LoadAnimation(script.Animation) -- name Animation to what you named your animation.
		wait(.3)
			Animation:Play() -- Plays your animation
		end
	
game.Players.PlayerAdded:connect(PlayAnimation)