It's only rotating? Not following the mouses position? (cmon, it only take a few minutes to answer)

So, i made a viewportframe, in the viewportframe i inserted a note. You can hold your mouse down and move it, to rotate the note. My problem is that it's just spinning, not following the mouse's position?

local Player = game.Players.LocalPlayer
local Mouse = Player:GetMouse()

local pressed = false
local moving = false

Mouse.Button1Down:Connect(function()
	
	pressed = true
end)

Mouse.Move:Connect(function()
	moving = true
	
end)

Mouse.Button1Up:Connect(function()
	
	moving = false
	pressed = false
end)

game:GetService("RunService").RenderStepped:Connect(function()
	if moving and pressed then
		if script.Parent.Visible == true then
		script.Parent:FindFirstChildOfClass("Model").PrimaryPart.CFrame =  script.Parent:FindFirstChildOfClass("Model").PrimaryPart.CFrame * CFrame.Angles(math.rad(Mouse.X/500), 0, 0) 
	end
	end
end)

What you are looking for is adding a vector to the primary part. You will need to experiment with different values, as this will depend on part size, viewportframe's camera positition, etc...

script.Parent:FindFirstChildOfClass("Model").PrimaryPart.CFrame = (  script.Parent:FindFirstChildOfClass("Model").PrimaryPart.CFrame  + Vector3.new(Mouse.X/10, Mouse.Y/10,0) ) * CFrame.Angles(math.rad(Mouse.X/500), 0, 0) 

I suggest to optimize your code a little bit and find this part only once:

local part = script.Parent:FindFirstChildOfClass("Model").PrimaryPart

game:GetService("RunService").RenderStepped:Connect(function()
    if moving and pressed then
        if script.Parent.Visible == true then
       part.CFrame =  (part.CFrame + Vector3.new(Mouse.X/10, Mouse.Y/10,0) ) * CFrame.Angles(math.rad(Mouse.X/500), 0, 0) 
    end
    end
end)

To reduce unnecessary execution, connect the function only when needed.

local part = script.Parent:FindFirstChildOfClass("Model").PrimaryPart

local function Step()

	if script.Parent.Visible == true then
		part.CFrame =  (part.CFrame + Vector3.new(Mouse.X/10, Mouse.Y/10,0) ) * CFrame.Angles(math.rad(Mouse.X/500), 0, 0) 
	end

end

local connection

Mouse.Button1Down:Connect(function()

	pressed = true

end)

Mouse.Move:Connect(function()
    moving = true
	if pressed and not connection then
		connection = game:GetService("RunService").RenderStepped:Connect(Step)
	end
end)

Mouse.Button1Up:Connect(function()

    moving = false
    pressed = false
	if connection then
		connection:Disconnect()
		connection = nil
	end
end)

Finally, unless you are moving camera around, it is recommended to use Heartbeat instead of RenderStepped

connection = game:GetService("RunService").Heartbeat:Connect(Step)

Have a nice scripting session!