The last day to upload documents was specified as the 20th, but you encountered issues with the minority certificate and were informed on the 21st, here are some steps that you can follow:
1. Contact the Admissions Office Immediately

• Explain the Situation : Inform them of the defect and provide details about why the document could not be uploaded on time.
• Request Extension : Ask if they can grant an extension or allow you to upload the corrected document despite the deadline.
  
  2. Check Online Portal
• Document Upload Section : Look for any instructions or updates on the portal where you upload documents. Sometimes, the system might still allow uploads beyond the deadline, especially if there are issues reported.
  
  3. Follow-Up
• Confirmation : Ensure that once you upload the corrected document, you receive a confirmation or acknowledgment that it has been received and is under review.
  
  4. Document Proof
• Keep Records : Save any communication with the admissions office and take screenshots of your document uploads for your records.
  
  I hope it helps.