I want to use a shortcode to replace it with an image form a url.
I post this shortcode usinbg IFTTT. After publishing the article the shortcode should be replaced by the image. But the image should come from my "local" library. So the shortcode should download the image, replace it self with a html tag for the image in the library ... that's it :-D
Is it possible to use a shortcode that way? How?