How to share the invoices in the NPCI GST portal?

How to share the invoices in the NPCI GST portal?

Members are required to login to the SFTP application with the login credentials provided by NPCI. In the Outgoing folder the invoices and the excel file (GSTR1 format) containing the details of the invoices are to be kept for invoice sharing. The files have to be kept as it is and not in any of the folders nor by creating any folder.