Most apps are not allowed to use MANAGE_EXTERNAL_STORAGE

You can give storage permissions to the apps made by a good and well known developer. Then, it is full secure and your data won’t be lost . Unless you give storage permissions to crap apps,you needn’t worry that your data will be unsecure.

When an app is granted storage permission, it can access the device storage at any time. This means it can upload personal files or even delete sensitive information from the device, so it’s better to think twice before giving storage permission to untrusted apps, as it can be harmful .