I was about to file GSTR1. Have filed GSTR3B already through Zoho. I have the following questions.

1. In some forums, people are talking about compiling state-wise data for ecom service providers before filing GSTR1. Do we need to follow any such thing in Zoho. As far as I understand, GSTR1 is automated in Zoho. We need to just push and file. Pls confirm this
2. In GSTR1, I am also seeing the invoices where the products were returned by the customer. For these invoices, I have already added a credit note while filing GSTR-3B due to which the total sale became zero. Should they appear in GSTR1? Is it right?