Loading bar doesn't want to get bigger?

Hi, I'm making a loading GUI, when something is loaded with the ContentProvider then the loading bar of the GUI gets bigger, but this is not the case. The loading bar remains miniscule, even so small that you can't see it with the naked eye. Does anyone know how else to do it? There are no errors in my output.

Code:

local ReplicatedFirst = game:GetService("ReplicatedFirst")

ReplicatedFirst:RemoveDefaultLoadingScreen()

local Players = game:GetService("Players")

local Player = Players.LocalPlayer

local PlayerGui = Player:WaitForChild("PlayerGui")

local LoadingGui = script.LoadingGui

LoadingGui.Parent = PlayerGui

local MainFrame = LoadingGui.MainFrame

local LoadingBar = MainFrame.LoadingBar

local Bar = LoadingBar.Bar

local ContentProvider = game:GetService("ContentProvider")

local AssetsLoaded = 0

local AssetsToLoad = game:GetDescendants()

for _,V in ipairs(AssetsToLoad) do

    ContentProvider:PreloadAsync({V})

    AssetsLoaded += 1

    Bar.Size = UDim2.new(1/AssetsLoaded, 0, 1, 0)
end

LoadingGui:Destroy()