Hi!
if you’re submitting online, then it will specifically ask you for specific documents in their own sections like:
copy of LPR card,
marriage certificate,
USC Spouse’s birth certificate,
if you’re a male and fulfill the criteria, then proof of selective service registration,
and tax documents.
Apart from this, there is an additional supporting documents section where you can add whatever. I added:
our joint lease agreement,
spouse’s US passport bio page,
one debit card statement PDF since 01/2021,
and one credit card statement PDF since 01/2021, where we have joint ownership.
Also filing under 3 year rule! Hope this helps! Good luck!