Add any background we want in file explorer?

Good?

You can upload it to Imgur and paste the link as your custom background.

@Nguyen2 said in #2:
> You can upload it to Imgur and paste the link as your custom background.

No need, .jpg .gif .jpeg .png files from any site are supported in background.

Well yes, but OP said they wanted to use a file on their computer.

Well different protocols of web security disallow that