Upon checking, there's an ongoing investigation about invoices not showing in the iOS QuickBooks Online (QBO) mobile app. I recommend contacting our Customer Support Team to be added to the list of affected users and receive notifications when the issue is resolved. Here's how you can reach them:
Log in to your QBO account.
Click the Help button at the top right corner.
Go to the Search tab, then select Contact Us.
Enter a brief discussion of your concern, then click Continue.
Choose to Have us call you to connect with us.
Our customer support schedule for Plus, Essentials, and Simple Start users is from Monday to Friday, 6 AM to 6 PM PT, and Saturdays from 6 AM to 3 PM PT. If you are using the Advanced version, assistance is accessible 24/7.
In the meantime, you can log in to your QBO account using a browser.
I'm ready to back you up if you need more help managing your invoices in the QBO mobile app. I'll keep the thread open so you can comment back. Take care!