You haven't mentioned the reason as to why you couldn't upload the document. The official website states that 13th of November was the last date to upload the documents. But the login page hasn't been disabled yet. So please do check if you can upload the documents at: https://cetonline.karnataka.gov.in/ugcetupload2020/Views/LoginPage.aspx.  Please get in touch with the helpdesk on Monday to check the possibilities.