I'm here to share some details on how you can download and export your GSTR1 report in QuickBooks Online (QBO).
To start, you'll want to save your GST-related data directly on the GST portal. Follow these steps to proceed:
Navigate to Reports and search for GSTR-1: Summary of outward supplies Report.
Select the time range for which you want the report to be displayed.
Once you’ve made the date selection, the option to Save GSTR-1 on GST portal gets disabled.
Click Run report. The option to Save GSTR-1 on GST portal will get enabled once you’re done running the report.
Select Save GSTR-1 on GST portal. Then, a new drawer will open up while your GSTR-1 information is checked in the background.
Once your data has been verified, proceed by following the instructions on-screen.
For more information about this process, visit this article: GSTR-1 Save.
Regarding your concern about exporting your QuickBooks data for GSTR1, simply check out this article for your reference and as a guide to the export process: How to export QuickBooks data for GSTR1.
To learn more about these reports and how to file your GSTR1 with the government in QBO, I highly suggest checking out these articles: