gstr 2 confirming

If you have any modifications such as deletion, change, and addition of missing of invoices, you have to make the modifications in GSTR2. After all the modifications, click on save changes in every table. Then after click on preview button in gstr2 screen. it will give you details of purchases in pdf form. Check once & proceed to sumbit. Once you sumbit the return, you cant do any modification to it after that. After sumbission, wait for few minutes & click on file return button. Once you click on file, your filing status will change to "Filed". This is how you have to confirm your invoices in GSTR2