Why won't my asset images load?

--Local Script
local cp = game:GetService("ContentProvider")
local toLoad = {}
for i,v in pairs(game.ReplicatedStorage.ItemList:GetChildren()) do
	for _,item in pairs(v:GetChildren()) do
		for index,value in pairs(item:GetChildren()) do
			if value.ImageId.Value ~= 0 then
				table.insert(toLoad, "http://www.roblox.com/asset/?id=" .. value.ImageId.Value)
			end
		end
	end
end
for i,v in next,toLoad do
	cp:Preload(v)
end

--Later in the script...
itemFrameClone.ImageLabel.ImageButton.Image = "http://www.roblox.com/asset/?id=" .. item.ImageId.Value

I tried pre-loading images, but it made no difference, unless I am doing it wrong. There is always an error that says "failed to load texture format" and the image never shows on the ImageButton.

Help appreciated, thanks!

When you want to turn an image or decal for a game, you have to change the asset IRL.To get the asset URL, you need to take the ID and subtract one (or two/three if someone uploaded something at exactly the same time as you). *Hint: you can use this method to copy any shirts, pants, and t-shirts. And I don't know if your script is right or wrong.

Example

https://www.roblox.com/catalog/156476828/Donation

would be come

https://www.roblox.com/catalog/156476827/Donation

Or

https://www.roblox.com/library/386230624/Roblox-decals

would become

https://www.roblox.com/library/386230623/Roblox-decals