How do i play Idle animation on custom rig?

I already have my moving animation for custom rig and it works by checking if npc is moving

local character = script.Parent
local humanoid = character:WaitForChild("Humanoid")

local walkAnim = script:WaitForChild("Walk")
local walkAnimTrack = humanoid.Animator:LoadAnimation(walkAnim)

humanoid.Running:Connect(function(speed)
	if speed > 0 then
		if not walkAnimTrack.IsPlaying then
			walkAnimTrack:Play()
		end
	else
		if walkAnimTrack.IsPlaying then
			walkAnimTrack:Stop()
		end
	end
end)

But for some reason when i do the same for Idle it doesnt work

local character = script.Parent
local humanoid = character:WaitForChild("Humanoid")

local idleAnim = script:WaitForChild("Idle")
local idleAnimTrack = humanoid.Animator:LoadAnimation(idleAnim)

humanoid.Running:Connect(function(speed)
	if speed > 0 then
		if idleAnimTrack.IsPlaying then
			idleAnimTrack:Stop()
		end
	else
		if not idleAnimTrack.IsPlaying then
			idleAnimTrack:Play()
		end
	end
end)

(Btw using roblox's animate script doesnt work) Can anyone help me?

you need to make the animations your self using the custom rig

test the animatesauce from baconchiips and with it you can also put a walk,run,jump,climb,others animations