What is the best way to go about implementing the following functionality?
-User initiates to add a "placeholder" image to the timeline. As part of this process, the user is directed to a website to configure the image settings.
-At some time in the future, when the image has been generated on the website, get the image from the website and replace the placeholder image with the final image.
Is this something that could be accomplished through a plugin? Or is there another mechanism that is better?