You wont get an update on additional documents , I phoned them yesterday as we had to send a marriage certificate off, They got it next day 5th May . The original old passport was received on 28th April, 13 days after being sent . The person I spoke to on the advice line stated the application tracking wont be updated on line, but she did say that it takes 2-3 weeks for additional documents to be looked at . I’m hoping the next update is approved. We are not going away until mid August original application was 15th April.