HELP! What method does Dartmouth prefer for sending Letters of Continued Interest?

I’m a deferred ED applicant and was wondering if Dartmouth prefers letters of continued interest to be added to the additional information section, sent to the general admissions email, or emailed to the region-specific admissions officer. If it’s not known which is most preferred, where are other people sending them?

Earlier this year (prior to applying) I was planning on emailing my region’s admissions officer, only to find out that they had recently stopped working there. My guidance counselor called Dartmouth to ask who my school’s new officer was, and then asked for their email only to be told that Dartmouth “discourages” emails sent to specific officers. I had never heard this information before then and have never seen it anywhere else, but didn’t know if this attitude also applies to letters of continued interest.

Also - do they even want a letter? Or is only putting any updates in the additional information section be enough?

hello I didnt get deferred but waitlisted to another ivy. I was also planning on sending in a letter but mine says that we are free to send in a letter with updates. Do you know if all Ivys are discouraging the letter or just Dartmouth?