Be careful when giving apps access to your files. Only download apps from trusted sources like Google Play or the App Store. Check the permissions requests and only grant access if it is required for the app to work. Only grant access to files or data that are relevant to the app's functionality.
For example, a photo editing app might need access to your photos, but it shouldn't require access to your call history and location. Keep your apps and phone software up to date to stay secure.
Going Further
Remember to check our Cyber Security Best Practices article for more useful tips about security.