A. 1. Check file permissions: Ensure that V2Box has the necessary permissions to access files on your device. Go to 'Settings' > 'Apps' > 'V2Box' > 'Permissions' and enable any necessary permissions. 2. Restart the app: Close V2Box completely and reopen it to refresh its access to files.

B. 3. Use a different file-sharing method: If the app continues to have locking issues, consider using a different method to share files, such as cloud storage services.