Let me share some details about the mobile app, dmsclean.
Currently, there are some feature that are only available when you access QBO through a desktop or a mobile browser (desktop mode) You can use this link for reference on what you can do or see on the mobile app: Compare mobile app features.
Meanwhile, you should be able to see customer invoices and other transactions in the app. We have a few troubleshooting steps that can help you view those transactions. You can follow the detailed steps in this link: Troubleshooting Quick-Start Guide for the QuickBooks Online app.
If the same thing happens, you can contact our Customer Care Team about this matter. They can review your account and provide additional information of what is happening. You can reach them using this link: QuickBooks Online Support.
You can always get back to us if you encounter specific error message or code so we can review it as well.