Hi there! I understand you're having trouble upgrading the Citi app on your Android device running version 10. That can definitely get in the way of smooth app use. To help you better, could you tell me if you’re seeing any specific error messages or what exactly happens when you try to upgrade? For example, does the app update start but then fail, or does it say something like "update not available" or "insufficient storage"?

Meanwhile, here are some initial steps we can try to resolve typical app upgrade issues on Android:

1. Check Your Internet Connection: Make sure you have a stable Wi-Fi or mobile data connection.

2. Clear the Google Play Store Cache & Data:
- Go to Settings > Apps & notifications > See all apps.
- Scroll down and tap Google Play Store.
- Tap Storage & cache.
- Select Clear Cache and then Clear Storage (or Data).
- Restart your device and try updating the app again.

3. Check Available Storage Space:
- Go to Settings > Storage.
- If your device is running low on space, try freeing up some storage by deleting unused apps or files.

4. Uninstall and Reinstall the Citi App:
- If clearing cache doesn’t help, uninstall the Citi app completely.
- Then, go back to the Google Play Store and install the latest version fresh.
- This sometimes resolves update glitches that happen during incremental updates.

5. Ensure Your Android OS is Updated:
- Go to Settings > System > System update.
- Confirm your Android 10 has all latest patches.
- Some apps need the latest OS updates to install newer app versions.

If you've already tried any of these, please let me know which ones, and if you get any error messages during the process. That way, I can provide more advanced troubleshooting or escalate if needed.

Are you able to check these and tell me what you find?