It may be that it's in a local script, but the following lines should play a custom animation I made. It works for me, but none of my friends see the animation. Any ideas why?
local animation = game.Players.LocalPlayer.Character.Humanoid:LoadAnimation(script.Parent.Animation)
animation:Play()

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So if the animation is in my game as well as my inventory, anyone who plays the game will be able to see it?