Ok that has given you clue. Go with everything and also some other more proof that has not been submitted before. That interview is purposely because they are doubting your relationship if it’s genuine. Try and gather more info about your spouse and make sure you touch the physical, emotional, financial and publicity of your relationship. That will convince the interviewer that u guys are genuine. Best of luckThanks for your concern, the email they sent to me stated as follow : The purpose of this interview will be to determine your eligibility for admission to Canada. And I was told to come with pictures of our marriage, my birth certificate, wedding certificate and proof of communication.