If the Panda Express app is not sending your order, you can take the following steps to troubleshoot and resolve the issue:

1. Check Your Internet Connection: Ensure that your device is connected to a stable Wi-Fi or cellular network. Poor connectivity can prevent the app from processing your order.

2. Update the App: Open the Google Play Store and search for the Panda Express app. If an update is available, install it. Keeping your app updated can resolve many issues.

3. Clear App Cache:
- Go to your device's Settings.
- Select Apps or Application Manager.
- Find and select Panda Express.
- Tap on Storage and then select Clear Cache. This can help clear any temporary data that might be causing problems.

4. Restart the App: Completely close the Panda Express app and then reopen it. Sometimes, simply restarting the app can clear temporary glitches.

5. Reboot Your Device: Power off your Android device, wait a few seconds, and then power it back on. A fresh start can fix minor software issues.

6. Check for App Outages: Visit the official Panda Express social media pages or community forums to see if there are any ongoing issues or outages affecting the app. For example, previous reports indicated that their online ordering system has experienced slowdowns due to high traffic - learn more.

7. Try Alternative Ordering Methods: If the app continues to fail, consider ordering directly from the Panda Express website or calling their customer service at 1 (800) 877-8988 for assistance - learn more.

8. Reinstall the App: If the above steps do not work, uninstall the Panda Express app and then reinstall it from the Google Play Store. This can often resolve persistent app issues.

9. Check for Device Issues: If other apps are also malfunctioning, the issue might be with your device. Ensure your operating system is up to date.

10. Contact Support: If you continue to experience difficulties after attempting these steps, reach out to Panda Express Customer Service for further assistance - learn more.

By following these steps, you should be able to address the problem of the Panda Express app not sending your order.

Several Panda employees and customers on Reddit Geometry Dash Lite also recommend using the browser website instead of the mobile app because it tends to be more reliable.