As part of the KYC process, regulations require you to provide a snap of address proof: like passport, Aadhaar Card, Voters Identity Card, Driving License, Utility Bills (telephone bills for landline only, electricity bill, gas bill not more than 6 months old), bank account statement (not more than 6 months old).
However, if you are already a KYC verified customer, you don’t need to provide this document.