Why won't the money save when I test it?

The script won't save the money in studio.

Here is the code:

local DSS = game:GetService("DataStoreService")

local Money = DSS:GetDataStore("Cash")

game.Players.PlayerAdded:Connect(function(plr)

local pCash = Money:GetAsync(plr.UserId)or 10

local leaderstats = Instance.new("Folder",plr)

leaderstats.Name = "leaderstats"

local CashValue = Instance.new("NumberValue")

CashValue.Name = "Cash"

CashValue.Value = pCash

CashValue.Parent = leaderstats

CashValue.Changed:connect(function(v)

Money:SetAsync(plr.UserId,v)

end)

end)

I hope you can help, thank you!