Hi there! I understand your Private Photo Vault app is not opening on your Android device running version 10. Could you tell me a little more about what happens when you try to open it? For example, does the app crash immediately, show a loading screen and get stuck, or simply not respond at all? Also, have you tried any steps already to fix this? This will help me guide you best.

Meanwhile, here’s a step-by-step approach we can try together:

1. Restart your device: Sometimes a simple reboot refreshes the system and can resolve app launch issues.

2. Clear the app’s cache: On Android 10, go to Settings > Apps > Private Photo Vault > Storage > Clear Cache. This removes temporary files that might be causing it to hang.

3. Force stop and reopen: In the same app info screen, tap Force Stop, then try relaunching the app.

4. Check for app updates: Open the Google Play Store, search for Private Photo Vault, and see if an update is available. Installing the latest version can fix bugs.

5. Check Storage Permissions: Make sure the app has proper permission to access storage, as lack of permission can cause it to fail to open properly. Go to Settings > Apps > Private Photo Vault > Permissions and ensure Storage is allowed.

6. Clear app data (if no sensitive data loss risk): This is a more drastic step as it may erase some saved settings. If you can, back up any important photos or data from the vault first. Then go to Settings > Apps > Private Photo Vault > Storage > Clear Data.

If none of these work, let me know what you observed after trying these, and we can look into further options — like checking for any device compatibility issues or server-side problems.

Please try these steps and let me know how it goes! Are you satisfied with the guidance so far?