Android read write permission

If app requires to download an image it requires your storage permission in order to save that image it requires permission . If you allow the storage permission it can access the data,in case of data breach or any other leaks app can allow its self to get the data.

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.

Yes. The storage permission grants an app access to the whole “Internal SD Card”, where all your photos, musics, downloads reside . It’s usually safe to assume that apps you trust access only what they need, but a random unknown app may scan your files and expose some privacy problem.24 Eyl 2018