Question about "Acceptd" Letters of Recommendation

Hello! After my son enters the email for a recommender for each school, is the recommender prompted to provide a tailored letter for each school? Or does the recommender upload a single letter that will go to all assigned schools (as CommonApp does). I emailed and called Acceptd but haven’t received a reply.

Thansk You!

I am not 100% sure but I think the recommender has to go in and select the letter again because my son had letters go to one school a few weeks ago and the other day he submitted an app to another school and one of the letters still says pending even though that teacher submitted a letter through acceptd a few weeks ago. I think they can use the same letter but the recommender has to go in and physically select it. It’s not automatic.