Hi Quick quesiton,As far as I know, you just have to provide as many evidence as possible. That includes:
Marriage certificate
Join bank account details
Photos you've taken together, and with family members or friends (from first to last - timeline format)
Gifts or money you sent to each-other (online/offline receipts, transactions and emails)
Call and chat history (get screenshots from your phone and include them in a word/pdf file)
Since you're newly married its also better to get couple of signed letters (notarized affidavits) from closest family members or friends stating they know about your marriage and love you have for each other, etc.
They ask for ID proof. As my spouse does not have a drivers license only option is her NIC. But, her NIC is the old one and its in Sinhala. Do I need to get it translated or just upload it or do you suggest getting a new NIC. But, her old NIC number is linked to her foreign PCC