"Create a part that plays a loading screen located on screen gui on player touch"

-- server script for the part 
local part = script.Parent

local function playLoadingScreen(otherPart)
    local player = game.Players:FindFirstChild(otherPart.Parent.Name)
    if player then
        local loadingScreen = player.PlayerGui:FindFirstChild("LoadingScreen")
        if loadingScreen then
            game.ReplicatedStorage.PlayLoadingScreen:FireClient(player)
        end
    end
end

part.Touched:Connect(playLoadingScreen)

-- server script in ReplicatedStorage 
local remoteEvent = Instance.new("RemoteEvent")
remoteEvent.Name = "PlayLoadingScreen"
remoteEvent.Parent = game.ReplicatedStorage

-- local script in StarterPlayerScripts 
local replicatedStorage = game:GetService("ReplicatedStorage")
local player = game.Players.LocalPlayer
local loadingScreen = player.PlayerGui.LoadingScreen

replicatedStorage.PlayLoadingScreen.OnClientEvent:Connect(function()
    loadingScreen.Enabled = true
    wait(5) -- Change this value to the duration of the loading screen
    loadingScreen.Enabled = false
end)