To resolve the issue of the Miles app not picking up mileage driven, follow these steps carefully:

1. Verify App Status: Ensure that the Miles app is open and running in the background. The app must stay active to track mileage effectively, so check if it has been accidentally closed - learn more.

2. Check GPS Settings: Confirm that your device's GPS is enabled. If GPS tracking is turned off, the app will not be able to record your travels. Navigate to your device's settings to turn on GPS - learn more.

3. Inspect Battery Settings: Review your phone's battery settings. If your phone is in low battery saver mode, it may restrict background activities, including app performance. Make sure that battery saver features are adjusted to allow the app to run properly - learn more.

4. Internet Connectivity: Ensure that your device has a stable internet connection. A lack of mobile data can affect app functionality and trip recording - learn more.

5. Enable Drive Detection: Open the Miles app and check if the drive detection is active. Look for an indicator that shows drive detection is "On." If it’s paused, enable it - learn more.

6. Reinstall the App: If all else fails, consider uninstalling the Miles app and then reinstalling it from the App Store. After reinstalling, log in with the same account to restore access - learn more.

7. Contact Support: If none of the above steps resolve the issue, reach out to Miles customer support for further assistance. They may provide additional troubleshooting tailored to your situation.

Following these steps should help restore the functionality of the Miles app and enable it to properly track your mileage.