Permission Denied even after granting the Storage Permission - flutter

Question

I have added every thing required to download files to local storage still I'm getting this error
[ERROR:flutter/lib/ui/ui_dart_state.cc(209)] Unhandled Exception:
FileSystemException: Creation failed, path =
'/storage/emulated/0/uth_content' (OS Error: Operation not permitted,
errno = 1)
In Manifest
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.ACCESS_MEDIA_LOCATION"/>
android:requestLegacyExternalStorage="true"
android:hardwareAccelerated="true"
<application
android:requestLegacyExternalStorage="true" >
In pubspec.yaml
permission_handler: ^6.1.1
My Dart File
#override
Future<int> downloadZipFile() async{
Directory extStorage = await _externalDataSource.GetExtStoragePath();
if(extStorage !=null) {
var response = await _apiDataSource.downloadZipContent(extStorage.path);
File zipfile = await response.zipFile;
debugPrint("Downloaded file :" + zipfile.path + "Exist: " + zipfile.existsSync().toString());
return response.statusCode;
}
else{
debugPrint("Path is empty");
createFolder("uth_content");
}
}
Future<String> createFolder(String cow) async {
final folderName = cow;
final path = Directory("/storage/emulated/0/$folderName");
var status = await Permission.storage.status;
if (!status.isGranted) {
await Permission.storage.request();
}
if ((await path.exists())) {
return path.path;
} else {
path.create();
return path.path;
}
}
How can I ensure that the folder is created, my android api is 30

Answer 1

You are missing this permission in your AndroidManifest.xml
<uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE"/>
To get the permission use
if (await Permission.manageExternalStorage.request().isGranted) {...}
NOTE: This permission is considered pretty risky so play store will reject your app unless it's your app's core functionality.
This is what google says
Core functionality is defined as the main purpose of the app. Without
this core functionality, the app is "broken" or rendered unusable. The
core functionality, as well as any core features that comprise this
core functionality, must all be prominently documented and promoted in
the app's description.
And if you are planning to create a file in an external directory and you are not able to find it, it's because you'd have to tell the device to refresh for the files. So I'd recommend using this package and passing your newly created file path to it or if you wanna do it manually with kotlin here's the code
private fun broadcastFileUpdate(path: String) {
context.sendBroadcast(Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.fromFile(File(path))))
println("updated!")
}