How do you use an animation that someone else published?

I've been looking up answers for a while, but nothing helps.

Me and someone else are in a Team Create and want to change players' walk animations to something we made. But we have a problem where the only animations that work on my character are the ones I make, and the ones that work for his character are the ones that he makes.

game.Players.PlayerAdded:Connect(function(plr)
	plr.CharacterAdded:Connect(function(char)
		char.Animate.walk.WalkAnim.AnimationId = "rbxassetid://[ID]"
		char.Animate.run.RunAnim.AnimationId = "rbxassetid://[ID]"
	end)
end)

This code works perfectly, but only with the animations that we made ourselves, not each other's. How do we use and change animations that the other person made, so that everyone can use them, not just the creator?