Saving data script not working and not giving an error?

Here's the script, Also should I put the script in a local script or a normal one and where should I put it?

               local DSS = game:GetService("DataStoreService")

local datastore = DSS:GetDataStore("GeneralSaveData", "Players")

function generateDataKey(player)
    local ret = "uid_" .. player.userId
    return ret
end

function generateDataTable(player)
    local dataTable = {
        Gold= player.leaderstats.Gold.Value,
        Fishies= player.leaderstats.Fishies.Value
    }
    return dataTable
end

function saveDataForPlayer(player)
    local key = generateDataKey(player)
    local data = generateDataTable(player)
    datastore:SetAsync(key, data)
end

function inputDataToPlayer(player, data)
    player.leaderstats.Gold.Value = data.Gold
    player.leaderstats.Fishies.Value = data.Fishies
end

function loadDataForPlayer(player)
    local key = generateDataKey(player)
    local data = datastore:GetAsync(key)
    inputDataToPlayer(player, data)
end

game.Players.PlayerAdded:Connect(function(player)
    loadDataForPlayer(player) --Load first thing when they join
    player.leaderstats.Fishies.Changed:Connect(function()
        saveDataForPlayer(player) --Save the data 
    end)
end)

game.Players.PlayerRemoving:Connect(saveDataForPlayer) --Save data when the player leaves the game