DataStore Saving System not working

Help and Feedback Scripting Support
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#1

Hello, i am going to try to keep this simple

  1. I want to achieve a “Trails Saving System”
    What is a “Trails Saving System” its when a person buys a “Trail” and the server saves it to the dataStore so when you join back you still have it as “Bought” in the shop

  2. The Saving doesn’t work if one person buys something it saves the bought thing to the server and no the player.
    So all the other people also see that it’s bought even though they haven’t.

  3. I have changed the code a few times searching for solutions online but nothing worked

The Script

local event = game.ReplicatedStorage.Shop
local players = game.Players

local trails = game.ServerStorage.Trails

local DataService = game:GetService("DataStoreService")
local TrailsData = DataService:GetDataStore("TrailsData2")

local OwnedTrails = {}

event.OnServerEvent:Connect(function(plr, TrailName)
	local plrID = "player_"..plr.UserId
	local char = plr.Character
	local head = char.Head
	local HRP = char.HumanoidRootPart
	
	local trail = trails:FindFirstChild(TrailName)
	local price = trail:FindFirstChild("Price")
	
	local PlrTrails = TrailsData:GetAsync(plrID).OwnedTrails
	
	local leaderstats = plr:FindFirstChild("leaderstats")
	
	if leaderstats.Coins.Value >= price.Value then
		if plr.PlayerGui.Shop.Trails.Trails:FindFirstChild(TrailName).Buy.Text ~= "Equipped" then
			if not table.find(PlrTrails, TrailName) then
				table.insert(PlrTrails, TrailName)
				end
			if plr.PlayerGui.Shop.Trails.Trails:FindFirstChild(TrailName).Buy.Text ~= "Equip" then
				leaderstats.Coins.Value -= price.Value
				end
			plr.PlayerGui.Shop.Trails.Trails:FindFirstChild(TrailName).Buy.Text = "Equipped"
			task.wait(0.5)
			plr.PlayerGui.Shop.Trails.Trails:FindFirstChild(TrailName).Buy.Text = "Equip"
			if plr.PlayerGui.Shop.Trails.Trails:FindFirstChild(TrailName):FindFirstChild("PriceText") then
				plr.PlayerGui.Shop.Trails.Trails:FindFirstChild(TrailName).PriceText:Destroy()
			end
		end
		
		local childHead = head:GetChildren()
		
		if not head:FindFirstChild(TrailName) then
			for i, v in pairs(childHead) do
				if v:IsA("Trail") then
					v:Destroy()
				end
			end
			task.wait(0.1)
			plr.Trails.EquippedTrail.Value = TrailName
			
			local EquippedTrail = trail:Clone()
			EquippedTrail.Parent = head
			EquippedTrail.Attachment0 = head.Attachment0
			EquippedTrail.Attachment1 = HRP.Attachment1
		end
	end
end)

players.PlayerAdded:Connect(function(plr)
	local TrailsFolder = Instance.new("Folder", plr)
	TrailsFolder.Name = "Trails"

	local EquippedTrail = Instance.new("StringValue", TrailsFolder)
	EquippedTrail.Name = "EquippedTrail"
	
	local plrID = "player_"..plr.UserId

	local data
	local success, errormessage = pcall(function()
		data = TrailsData:GetAsync(plrID)
	end)

	if success then
		if data then
			OwnedTrails = data.OwnedTrails
			EquippedTrail.Value = data.EquippedTrail
		end
	end
	
	plr.CharacterAdded:Connect(function()
	local char = plr.Character
	local head = char.Head
	local HRP = char.HumanoidRootPart
		
	if not head:FindFirstChild("Attachment0") then
		local attachment0 = Instance.new("Attachment", head)
		attachment0.Name = "Attachment0"
		local attachment1 = Instance.new("Attachment", HRP)
		attachment1.Name = "Attachment1"
		end
		
		local StartingTrail = trails:FindFirstChild(EquippedTrail.Value)
		local TrailClone = StartingTrail:Clone()
	TrailClone.Parent = head
	TrailClone.Attachment0 = head.Attachment0
		TrailClone.Attachment1 = HRP.Attachment1
	end)
end)
				
game.Players.PlayerRemoving:Connect(function(plr)
	local plrID = "player_"..plr.UserId

	local data = {
		OwnedTrails = {};
		EquippedTrail = plr.Trails.EquippedTrail.Value;
	}
	
	print(data.OwnedTrails)
	
	local success, errormessage = pcall(function()
		TrailsData:SetAsync(plrID, data)
	end)

	if success then
		print("TrailsData successfully saved!")
	else
		print("Error With Saving Trails Data")
		warn(errormessage)
	end

end)

game.Players.PlayerAdded:Connect(function(plr)
	local plrID = "player_"..plr.UserId
	
	repeat wait(1) until plr.PlayerGui:FindFirstChild("Shop")
	local TrailsShop = plr.PlayerGui.Shop.Trails.Trails
	local TrailsChildren = TrailsShop:GetChildren()
	
	local PlrTrails = TrailsData:GetAsync(plrID).OwnedTrails
	print(PlrTrails)
	
	for i, v in pairs(TrailsChildren) do
		if v:IsA("Frame") then
			if table.find(PlrTrails, v.Name) then
				local PriceText = v:FindFirstChild("PriceText")
				local Button = v:FindFirstChild("Buy")
				Button.Text = "Equip"
				PriceText:Destroy()
			end
		end
	end
end)

Thanks for your time. If something is missing or you need more information please ask.