ContentProvider:PreloadAsync() is not working or something?

um I have try many times but the shirt is not being loaded. so I make this to check

local check = false
repeat
    game:GetService("RunService").Stepped:Wait()
    coroutine.resume(coroutine.create(function()
        print("umm")
        local s = game:GetService("ContentProvider")
        s:PreloadAsync({"http://www.roblox.com/asset/?id=268265637", "http://www.roblox.com/asset/?id=765106897"},function()
            check = true
            print("ok")
        end)
    end))
until check == true

And this is the output.

umm (x3167718)

;-;