Hello there, Cora-Smith. Are you seeing a specific error message when the upload fails, or is the app keeping spinning? In the meantime, I recommend updating your app and performing the troubleshooting steps to enhance app functionality.
If you're using Android, clear the software data by going to Settings > Apps > QuickBooks app > Storage > Clear Data. For iPhone, navigate to Settings > App > iPhone Storage > QuickBooks App > Offload.
Once done, restart your phone and verify if the snap works properly. If the problem persists, uninstall the app and then reinstall it to proceed with your business tasks.