Common ap Letters of Recommendation

I have filled out the common ap. The last thing I am waiting for is one of my 2 letters of recommendation. The other one has turned their’s in and I have been waiting patiently for the second one. The deadline for submission is coming up very soon and I would really like to turn it in but I assume that you cannot add a second letter after it is submitted. Is this true? and do you have any advice on how I should handle this?

Have you filled in the recommender information? If so, you can turn it in. I submitted my app nearly a month before one of my recs (teacher was really late - I had to keep bugging her and it went in after the deadline) and it was fine. If a recommendation will be late, I would advise you to contact colleges and tell them - most will say it’s fine as long as it’s in soon.

Does it still work if they intend on turning it in through the system. Will it block them out from doing so if I submit it?

No, they can still submit their rec after you have sent off your part.