Authorization letter for submitting documents
Just saw the outdated answers here.
In the important notes section in the dropbox confirmation letter, it says u201cYou are not required to submit documents in person at the Drop-Off location but may send a representative carrying all the above listed documents as per specification.
u201d,Update - I took my wifeu2019s documents for Dropbox submissions while my own required an interview appointment.
No authorization letter was required and they just asked for the documents that they list in the Dropbox qualification/interview waiver email.