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Bring the specific thing.
The most useful messages name the page, what you expected, what happened, and what would have made it more useful.
Product feedback
The feedback form is the fastest route for accuracy problems, confusing copy, accessibility barriers, and ideas for the next version.
Privacy and clinical questions
Use the same form and identify the message as a privacy or clinical use question. Do not include sensitive medical records or information you would not want transmitted through a standard web form.