As everyone has said, do as much as you can and send to them. I will suggest that you mail all documents by DHL or fedex to Accra. You can have a cover letter (signed by the applicant) to AVO and the reason for this cover letter is to explain beyond reasonable doubt that you and your spouse are legally married and its a legit marriage. Let this cover letter be like a story some what and there will be different sets of printed pictures to buttress each section of the cover letter. This is what i did before submitting the application in Mississauga. Include as much documents as possible that you have. Dont say that this is too much or that is too much. Remember you are trying to convince the Immigration officer and you dont know what specific information he/she is looking for. The more you have and can show, the better you can explain your case to him/her.
Because you have to submit so many documents to Accra AVO, doing it online using MyCIC will not be sufficient. Good luck
@Denne