How to upload invoices in GSTOne portal?

How to upload invoices in GSTOne portal?

For NPCI invoices, Invoices need to be uploaded through Zip file by renaming the file as Product_YYYYMM. For Customized invoices, First enable the tab of Customized invoices Then Invoices need to be uploaded through Zip file by renaming Product_YYYYMM along with GSTR1 (should be in NPCI format only).