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@FinchHaven What you would need to do by hand—the functionality it does for you—is to select the text content of a post, copy it, paste that into the composer window, and then manually add the link to the original post and tag the poster.

The way it does that programmatically is to find the post ID from the url. It then uses the API to get the text of the post with that ID, adds the link and tag, then loads the composer page passing the text as a variable, so the text loads in the composer box.