GSTR1 - Unable to upload JSON file on GST Portal.

Users are experiencing an error when trying to upload their GSTR1 JSON file to the GST portal, even when using the latest offline tool version. The error message suggests downloading the latest tool or validating against the template. While some suggest checking the upload period or reinstalling the tool, the issue persists for some. It's recommended to check the upload period carefully and potentially try uploading from a different system, as forum advice may not fully resolve server-side or complex issues.