Cannot access SDcard (ExternalStorageDirectoryPath points to /storage/emulated/0)

Hello,
I am trying to access and modify files on an external SDcard on Android Marshmallow 6.0.1 (SDK 22)
In `AndroidManifest.xml` I have declared following permissions:
```

```

When I print `RNFS.ExternalStorageDirectoryPath` I can only get an emulated path (`/storage/emulated/0`) which is not on the SDcard.

I think this is most likely some permissions issue but I have checked everything: app permissions in settings which have storage enabled and also when I check the storage permissions dynamically using this code
```
const granted = await PermissionsAndroid.request(
PermissionsAndroid.PERMISSIONS.WRITE_EXTERNAL_STORAGE, {
title: "Grant SD card access",
message: "We need access"
}
);
if (granted === PermissionsAndroid.RESULTS.GRANTED) {
console.warn("Permission OK");
}
```
It works as expected so I am really out of ideas. Is there anything I might be missing or is this a bug with the library? Thank you for any help with this.