I was asked to explain the source of income and employment proof. While my initial application had those details available, I just prepared another cover letter and attached the same documents again. Eventually got approved.
Anonymous participant I understand but I recommend that you provide what you have been asked for and also make a summary slide/ sheet in the beginning so make it easier for understanding.
In certain situations applicants have been asked for confirmed tickets during the course of application assesment.
You should look at tickets and T&C of the tickets and provide dates accordingly. Just in case you are asked for the proof, you'll be in a position to provide it.