It says Attachment is not a valid member of part?

I put my part named "FireBall" in ReplicatedStorage. Inside "FireBall" there is Attachment but the Output says "Attachment is not a valid member of part."

I will put part of my script below. Tell me if you need the whole script to answer me.

-- Variables --
local Remote = ReplicatedStorage.FireBallEvent
local FireBall = ReplicatedStorage.FireBall
  
Remote.OnServerEvent:Connect(function(plr, Mouse)
 if not ServerDebounces[plr] then
  ServerDebounces[plr] = true

-- Settings --  

  local Char = plr.Character or plr.CharacterAdded:Wait()
 
  local FireBallClone = FireBall:Clone()

 local Enemy = Hum.Parent.Humanoid
    Enemy:TakeDamage(Damage)
    BodyVelocity:Destroy()
    FireBallClone.Attachment.Effect.Speed = NumberRange.new(8,8)
    wait(1)
    FireBallClone.Attachment.Effect.Enabled = false
	FireBallClone.Attachment.SmokeEffect.Enabled = false
    wait(1)
    FireBallClone:Destroy()

I don't know why it says that Attachment is not a valid member of part.

Effect and SmokeEffect is inside Attachment. and Attachment is inside the FireBall and FireBallClone is cloned FireBall. So Attachment is supposed to be inside FireBallClone isn't it?

Put these two in StarterPack:

For pressing key: (Local Script)

local Player = game.Players.LocalPlayer
local Mouse = Player:GetMouse()
local RemoteEvent = game.Workspace.Fired
local UIS = game:GetService("UserInputService")

local Debounce = false

UIS.InputBegan:Connect(function(Input, gameProcessed)
	if Input.KeyCode == Enum.KeyCode.F and gameProcessed == false then
		if Debounce == true then return end
		Debounce = true
		RemoteEvent:FireServer()
		wait(0.5) -- Change the interval between each fireball
		Debounce = false
	end
end)

Fireball creation (Normal Script)

game.Workspace.Fired.OnServerEvent:Connect(function(Player, Debounce)
	local AlreadyTouched = false
	local Character = Player.Character or Player.CharacterAdded:wait()
	local animation = Instance.new("Animation")
  	animation.AnimationId = "rbxassetid://846744780"
  	animation = Character.Humanoid:LoadAnimation(animation)
  	animation:Play() ----- Active animation
	wait(0.5)
	local Fireball = Instance.new("Part")
	local Fire = Instance.new("ParticleEmitter",Fireball)
	Fireball.Name = "Fireball"
	Fireball.Shape = Enum.PartType.Ball
	Fireball.Size = Vector3.new(2,2,2)
	Fireball.Material = Enum.Material.Neon
	Fireball.BrickColor = BrickColor.new("Deep orange")
	Fireball.CanCollide = false
	Fire.LightEmission = NumberRange.new(0.35)
	Fire.LightInfluence = NumberRange.new(0)
	Fire.Texture = "rbxassetid://405886187"
	Fire.Lifetime = NumberRange.new(0.5)
	Fire.Rate = 20
	Fire.Speed = NumberRange.new(3)
	Fire.SpreadAngle = Vector2.new(15.15)
	Fireball.Parent = Character
	Fireball.CFrame = Character.HumanoidRootPart.CFrame*CFrame.new(0,1,-3)
	local BV = Instance.new("BodyVelocity")
	BV.MaxForce = Vector3.new(math.huge,math.huge,math.huge)
	BV.Velocity = Character.HumanoidRootPart.CFrame.lookVector*100
	BV.Parent = Fireball
	
	Fireball.Touched:Connect(function(Hit)
		local Humanoid = Hit.Parent:FindFirstChild("Humanoid")
		
		if Humanoid == nil then return end
		
		if AlreadyTouched == false then
			AlreadyTouched = true
			local debris = game:GetService("Debris")
				if Humanoid then 
					local creatorTag = Instance.new("ObjectValue")
					creatorTag.Value = Player
					creatorTag.Name = "creator"
					creatorTag.Parent = Humanoid
					debris:AddItem(creatorTag, 1)
				end;
			if Humanoid.Parent == Character then
				Humanoid.Health = Humanoid.Health - 0
			else
				Humanoid.Health = Humanoid.Health - Humanoid.MaxHealth/2
				Fireball:Destroy()
			end
		end
	end)
	wait(3)
	Fireball:Destroy()
end)

And finally make a RemoteEvent in Workspace named "Fired"