You can submit following documents (if applicable):
- Joint Bank statement
- Joint Apartment/house Lease
- Joint Vehicle insurance
- Any shared assets like Car, Land, or any property with your and your spouse's name on docs
- Medical/Dental insurance if spouse is dependent
- Utilities bill/Bank statement issued on physical addresses that both of you share together
- Honeymoon pictures or travel pictures together
- Affidavit of your legit marriage by family, friends and relatives (I heard, Normally, this is only required in cases when IO doubt the marriage)