Hi BusyBusiness,
Welcome to the community! QuickBooks Self-Employed enables you to download your transactions so you can review, save, and print them if needed. I'll be happy to share more on this.
After downloading your file as a CSV file, you can preview it using Excel. If you're having issues with your file, you might want to ensure there's no bug in your system causing issues in the app. Uninstalling and reinstalling your app is a good way to troubleshooting any issues without losing your data.
If that doesn't help, I recommend reaching out to the QuickBooks Self-Employed team outside of community. Those agents are able to gather more details from you and do more in-depth troubleshooting to get things working again. Follow the steps in the article Contact QuickBooks Self-Employed Support to get in touch with them via QB Assistant or use the email form on our Contact Us page.
I hope this helps! Have a great day.