Oh so sorry. Just read your post once again. So your issue is uploading two documents for a single option. I guess you have to wait for any reply from SINP, in case they are not comfortable with two documents. Its really their system which has to be blamed for that. Even I did the same thing, but later sat and deleted everything so that one link has only one document. For that matter even I have submitted marriage certificate once under mine and once again under spouse details. So no harm as long as only one document is theree