Dear Apoorva, there is a difference between OBC and OBC NCL Certificate. OBC certificate is a proof that your Caste belongs to Other Backward Castes Category but OBC-NCL is for candidates whose annual income from all sources is less than 6 lakhs per annum. Such Candidates given financial and reservation benefits, Please raise a Candidate query for your application and reach out to the helpdesk to see if there is a provision where you can upload the Category certificate.