Why isn't my script changing the player's jump animation?

My script is supposed to make the player jump with this animation and allow them to be able to double jump with the use of another animation. As I test it output is giving me the right messages but the player just uses the normal jump animation and doesn't jump twice. Any help?

local DJ = game.ReplicatedStorage.DoubleJumped
local J = game.ReplicatedStorage.Jumped
local Player = game.Players.LocalPlayer
local UIS = game:GetService("UserInputService")
local JumpedOnce = false
local JumpedTwice = false

local Jump = Instance.new("Animation")
Jump.AnimationId = "rbxassetid://3090086909"
local DoubleJump = Instance.new("Animation")
DoubleJump.AnimationId = "rbxassetid://3090113038"

UIS.InputBegan:Connect(function(input, proc)
    if not proc and input.KeyCode == Enum.KeyCode.Space then
        if JumpedOnce == false then
            JumpedOnce = true
            print("Player Jumped")
            J:FireServer()
        wait(2)
        if JumpedOnce == true and UIS.InputChanged then
            if not proc and input.KeyCode == Enum.KeyCode.Space then
              JumpedTwice = true
              print("Player Double Jumped")
              DJ:FireServer()
            end
        end
        end
    end
    wait(3)
    JumpedOnce = false
    JumpedTwice = false
end)