As far as I remember, during the application procedure of JEE Main besides Xth and XIIth marksheets and I guess your Government ID Card , you do not need to upload any other Certificates or Documents during the Application Procedure of JEE Mains. Do keep an eye on the NTA Website for Procedure and Dates. For more information do follow the link below

https://engineering.careers360.com/articles/jee-main-application-form

Hi Aspirant!

The certificate required for JEE main application are

• Scanned images of photograph,
• Scanned copy of class 12 marksheet
• Class 12 hall ticket in case appearing for the exam
• Marksheet of class 10 and 12.
• Category certificates (If belonging to reserved category)
• Debit card/Internet banking details for payment of application fees
• Photo Identity proof such as Aadhaar, Bank passbook, Ration card copy etc.

For more details view the following site:

https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-application-form/amp

Hope this helps!

Thank you!