Welcome to the Community. Let's get those checks from your Green Dot app deposited to your QuickBooks Checking account.
Firstly, did you receive a specific error message when depositing your QuickBooks checking account using Green Dot? Also, ensure that when you take a photo, it's readable. If the photo is clear then still will not be accepted. I suggest clearing the app's cache. By clearing the cache, you can remove historical data and access your Green Dot with a clean state.
To start, let's refresh your data to see the latest available information in your Green Dot app to resolve this unexpected behavior.
Here's how:
iOS
Go to Settings, then tap General.
Click iPhone Storage, then tap the Green Dot app.
Select Offload App.
This will free up the storage without deleting your app's documents and data.
Android
Go to Menu ☰, then tap More Options ⋮.
Select Settings, then Refresh Data.
Click YES to confirm.
If the issue persists, you can uninstall and reinstall the Online mobile application. Otherwise if the problem continues, you can access Green Dot using other supported browsers.