Gst Invoice of March 2920

Dear expert,
I have forgotten to upload a tax invoice of March 2020 in my GSTR-1 and also escaped to report in GSTR-3B of march 2020. Now , I came to know about the mistake. Now the party is asking to upload the same in portal. All the GST returns are uploaded till the month July 2020.
Please let me to know in this matter how I can solve this problem.