react-native-fs cannot access storage - react-native

Question

i'm using react-native-fs package to save files to android storage.
when i perform these two lines of code, it works
await RNFS.readDir(RNFS.DocumentDirectoryPath);
=====>/data/user/0/com.youtubedljs/files
await RNFS.readDir(RNFS.CachesDirectoryPath);
=====>/data/user/0/com.youtubedljs/cache
but when i try to access external storage, like Download or documents files
await RNFS.readDir(RNFS.DownloadDirectoryPath);
i get this error
Error: Attempt to get length of null array
i already granted storage permissions to the application, it didn't work.
Update: Works fine on android 8.1, i think that the package doesn't support android 10 yet

Answer 1

Need to give read-write permissions.
that's okay.. but you also need to get incode permissions, before accessing file
import {PermissionsAndroid} from 'react-native';
const granted = await PermissionsAndroid.request(
PermissionsAndroid.PERMISSIONS.WRITE_EXTERNAL_STORAGE,
);
if (granted === PermissionsAndroid.RESULTS.GRANTED) {
//alert('You can use the location');
console.log('write granted');
return true;
} else {
return false;
}
} catch (err) {
console.warn(err);
return false;
}

Answer 2

First you have to ask for permission
then you can save the into download folder of mobile
import {request, PERMISSIONS} from 'react-native-permissions';
request(
Platform.OS === 'ios'
? PERMISSIONS.IOS.MEDIA_LIBRARY
: PERMISSIONS.ANDROID.WRITE_EXTERNAL_STORAGE,
).then(result => {
console.log(result);
);
});
var path = RNFS.DownloadDirectoryPath + '/filename.txt';