DISCLAIMER: This is an experiment. I would not recommend updating pads that anyone cares about.
Images, formatting, and comments don't persist correctly when appending with Zapier. Trying to figure that out... The API doesn't have an append operation, so append in zapier must GET and UPDATE content instead. That means "text" would be a problem. Found "html" replaces the entire page. Using "markdown" turned all comments into bullet points and caused issues with parenthesis. Markdown does show promise though.