This is a known issue that occurs on Android devices running on the latest Android 11 OS. Our development department is currently working on reproducing the issue and rebuilding the Viewer app for the Android to eliminate the issue. Unfortunately, there's no specific ETA on this fix, but we will make sure to notify all of our customers as soon as the issue is fixed and the updated build of Viewer for Android is released. Sorry for the inconvenience.
This is to inform you that we've fixed the app compatibility issue with mobile Viewer not working on devices running on Android 11. Please update your Viewer app to the latest version - it's available in Google Play Store.