I did this really quick, it works as expected. Did you do anything different than I did here that you can change?
Also, as far as I can remember, I think animations has to be pre-made and not real-time made as you play.
Animations can be created during run-time as long as they have a valid AnimationId property 
I remember having issues with that in the past, as well as other people.
function loadIdleAnimation(humanoid)
print(1)
local animation = script['Idle']
if not animation then return end
local animTrack = humanoid:LoadAnimation(animation)
if not animTrack then return end
animTrack.Looped = true
animTrack:Play()
if animTrack.IsPlaying then
print(humanoid, humanoid.Parent)
humanoid.Parent.Head.BrickColor = BrickColor.new('Cyan')
end
endThat’s extremely odd, have you made sure it has all the required motor6Ds?
Thanks. Could you try disabling the plugin and just have a plain R15 dummy rigged with appropriate Motor6Ds? Also, make sure the animation is created for R15.
Wait… Is the dummy anchored? (like… all the parts?)
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Ye, the script sets all the parts to be anchored, otherwise the model fallsover
That’s what’s stopping the animation hahaha, just anchor the humanoidrootpart and you’ll be good.
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The dummy won’t fall over the HumanoidRootPart is anchored. 
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If the head is rigged appropriately to the rest of the model, it should work fine. Are you moving the head in your code, or does the Motor6D just not exist?
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No, it seems like the motor6d joint breaks. But hey, who really need a head?
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Just wanted to give a little heads up on this part of your code;
If Idle wasn’t there, the script would error as it’d try and get it. I recommend using FindFirstChild to accomplish this.
local animation = script:FindFirstChild('Idle')
print(1)
if not animation then return end
Alternatively, if you wanted the script to yield until it got Idle, I recommend using WaitForChild.
local animation = script:WaitForChild('Idle')
print(1)
--if not animation then return end < Not necessary, since it'd yield for `Idle`.
Just a little something I noticed. 
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