I attended the webinar as well and here are a bit more specifics on items from the presentation, hope this helps! FYI, they encouraged communicating to the admissions via the portal and formally in email a lot
1. the status of "On hold for re-review" is an active status and common
2. Re-Reviews are unpredictable
-submitting an update does not automatically bring your application to the front of the stacks, since the reviews are unpredictable, you can get lucky with updating one day and 2 days later you are reviewed and it is right there with your file
3. They stressed using the Applicant Portal Update tool to inform the Admissions Committee about your current activities
-"Think like a person on admissions, what will make your update stand out as to others" as well as length of the update, that is up to the applicant
-you can update on variety of items: new job/promotion, clinical experience, past experience not on our AMCAS, awards, grades (not transcripts)
-letters of interest/intent are good
-you can expand upon what was in your AMCAS and or secondary essays as well say when you are writing a letter of intent