A constituent sends in a letter expressing his/her consents. Need to be able to keep a scanned copy of that letter in the contact pref history activity. Add doc upload feature to the staff facing pref centre form when in Edit mode Enable the doc to be uploaded on the Timeline when viewing the Contact Preference Confirmation activity (which only shows when filtering the TL to see Activities). At the moment that form doesn't expand to allow editing like other Activity TL entries do. By allowing it to do that you could use the standard doc upload feature on that form.