Here you can upload the details for GSTR3B for one GSTIN at a time through input format provided by IRIS. The data needs to be as per IRIS Input Formats.
So select GSTIN for which you want to upload data. Also here you can download auto-compute details for GSTR3B.
And fill rest of section details manually and upload the same file over here.
*Download the input format functionality is active. You can download the same.
You will see
In results, you can see the error messages. So in case of failure, solve those errors from
Once file got uploaded successfully, go to view section.