Trail effect not working and no idea why. Pls help?

I have no idea why it's not working, all of it seems to be working but it's just not. Here is the script:

game.Players.PlayerAdded:Connect(function(player)
	player.CharacterAdded:Connect(function(char)
	local trail = game.ServerStorage.Trail:Clone()
	trail.Parent = char.LeftUpperLeg
	local attachment0 = Instance.new("Attachment",char.LeftUpperLeg)
	print("Hi")
	attachment0.Name = "TrailAttachment0"
	local attachment1 = Instance.new("Attachment",char.LeftFoot)
	attachment1.Name = "TrailAttachment1"
	trail.Attachment0 = attachment0
	trail.Attachment1 = attachment1
	end)
end)

It seems that all of it is correct, but for some reason when I check my character when I test the game, it doesn't even seem to be making trail's parent to the LeftUpperLeg. It only works if I set it's parent to the Head. I want to make a trail that starts from your LeftUpperLeg until your LeftFoot, but it doesn't seem to be working. Pls help if u know ;-;