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Check for "Hidden Files" or clear the cache of the app in Settings > Apps. White Bars in App

: Open your app drawer or use the home screen search to find the app named Files . Huawei File Manager

Ensure you are using the default app, as some third-party managers may lack write permissions for external cards on newer EMUI versions. Check for "Hidden Files" or clear the cache

: If you have an external Memory Card, you can use the Files app to Move Data to SD by holding a file, selecting "Move," and picking the external drive as the destination. Huawei File Manager