How to keep a sound that is being cloned preloaded?

I am currently working on a series of guns for my game, for the sounds to sound good i need to clone the firing sound and play them whenever the gun is firing, however the cloned sounds don't seem to be preloading and the gun sounds horrible. How can I fix this?

I feel as the code for this should be fairly obvious but here is the code anyway

 local sound= game.ReplicatedStorage.Weapons[ 
 PlayerEWeapons[plr.Name]].FireSound:Clone()-- "PlayerEWeapons[plr.Name]" is the equipped weapon of the player
 sound.Parent=plr.Character.Head
 spawn(function()
    sound:Play()
    wait(sound.TimeLength)
    sound:Destroy()
  end)

here is my preloading code:

local contp=game:GetService("ContentProvider")
local assets={}
script.Parent.Loading.State.Text="Fetching Sounds to be loaded"
for i,v in pairs(game.ReplicatedStorage:GetDescendants())do
    if v:IsA("Sound")then
        contp:PreloadAsync({v},function()end)
    end
end
function LoadedAsset(contentid,sucsess)
    script.Parent.Loading.Asset.Text=contentid.."was loaded"
end
script.Parent.Loading:Destroy()