I'm here to help you successfully create a bank deposit on the go, @bcpm2005. I have troubleshooting steps to help fix this issue on the mobile app.
Before anything else, did you receive any error messages? Any additional information will help me provide the most suitable solution.
To check if the app's data is causing this odd behavior, I suggest resetting it. This process plays the same role as clearing the cache from your web browser. I'll show you how:
iOS
Go to the Menu ☰ and select Help & Feedback.
Tap Refresh Data.
Note: A message appears “Caution. If there was a problem getting your latest QuickBooks Online data, you can refresh it now. It may take a few minutes.”
Click Refresh to confirm.
Android
Select Menu ☰ then tap More Options ⋮.
Tap Settings, then Refresh Data.
Click YES to confirm.
You might want to learn how bank deposit works in the QBO app: