I have a few questions about Custom background for any post from any user.
- Adding custom button (icon) in to a post editor.
- Setting rules for the background image: should hover a whole post background but always be behind post text/images and other insert codes. E.G: you have a custom width for any post 690px, so even when your custom backround image will be larger then these 690px, it will auto adjust to the 690px width.
- Adding options to the custom button, so user can choose how they may upload the background image: link/upload.
- And yes all uploaded images should be placed in the same directory as all others do.
Here we go, some example of how it should look: