Hello aspirant
In jee advanced you have to give your OBC-NCL certificate issued on or after April 01, 2021. As you mention you have OBC-NCL certificate issued on the month of October last year, it is clearly visible that it will not be applicable.
In case you fails to upload OBC-NCL certificate, you can upload a declaration form which will be available at jee advanced official website.

Hope this helps you
Good luck :)

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