You can troubleshoot your browser to fix the error you encounter when saving your invoices, @2266583AB.
To begin with, clearing your cache and Intuit-specific cookies can help remove any outdated or corrupted data that may be causing the issue. Alternatively, you can use a supported browser, such as Google Chrome or Mozilla Firefox, to access your QuickBooks Online account. It's also important to ensure you have a stable internet connection when saving your invoices.
If you have any follow-up questions, please don't hesitate to leave a comment.