how to pass an image to a webhook

I have an app that captures people's top 10 movies and I have a poster field that points to a corresponding movie poster image in the default folder (ex- 1234.jpg) .  My question is how to pass that image (versus just the text of that filename) to a webhook.  My dream is to create a "my top 10 movie posters" template that a user could press a button and it would post an image of their top 10 movie posters on instagram.  Trying to figure out how to do this.  Any help would be greatly appreciated.

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