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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Depends on what the destination can accept.

Can it accept a public URL to an image? If so, you can build that in Appsheet, as long as you disable a few security options. See here:

https://help.appsheet.com/en/articles/961605-displaying-images-and-documents

Or does it accept a 64-bit encoded image? Appsheet can't do that, but you could set up a Google App Script to do so, and store the 64-bit string in the row.