CommonApp: Question regarding recommendation letters?

<p>I'm applying ED for a college. One of my recommenders may not have her letter finished by the time I plan to apply (I originally informed her that I planned to apply in January, before I decided on ED). I notice that the application can be submitted even before the letters have been uploaded. This is probably a silly question, but does that mean that it's possible for them to be uploaded after submission? </p>