Qt 6, Android 11 widget application, read and write to file. permission denied

Question

hope can point me in the right direction on how to fix my application so i could read and write a simple .txt file.

i think i have tried all solutions out thier is on the world wide web, but hit me with what i should try.

things i have tried:

    bool value = QJniObject::callStaticMethod<jboolean>("android/os/Environment","isExternalStorageManager");
    if(!value){
        QJniObject filepermit = QJniObject::getStaticObjectField("android/provider/Settings","ACTION_MANAGE_APP_ALL_FILES_ACCES_PERMISSION","Ljava/lang/string;");
        //you must changing the YOURPKGNAME at below
        QJniObject pkgName = QJniObject::fromString("package:org.qtproject.example.robotinterfaceandroidqt");
        QJniObject parsedUri = QJniObject::callStaticObjectMethod(
                        "android/net/Uri",
                        "parse","(Ljava/lang/String;)Landroid/net/Uri;",
                         pkgName.object<jstring>());
        QJniObject intent("android/content/Intent",
                          "(Ljava/lang/String;Landroid/net/Uri;)V",
                          filepermit.object<jstring>(),parsedUri.object());
        QtAndroidPrivate::startActivity(intent, 0);
    }else{
        qDebug() << "NEW PERMISSION IS NOT GRANTED";
    }

this gives me a prompt screen to allow acces but in allow acces to all files it is just all gray and cant be set to permission to acces all files.

The other thing i have tried:

int counter = 0;
bool permission(){
    auto result = QtAndroidPrivate::checkPermission("android.permission.MANAGE_EXTERNAL_STORAGE").result();
    if(result == QtAndroidPrivate::PermissionResult::Denied){
        result = QtAndroidPrivate::requestPermission(QString("android.permission.MANAGE_EXTERNAL_STORAGE")).result();
        counter++;
        if(counter > 10)
            qDebug() << "CANNOT GIVE THAT KIND OF PERMISSION";
        permission();
    }else{
        counter = 0;
        return true;
    }
return false;
}

have also tryied that with EXTERNAL_READ_STORAGE and write even with qts own QtAndroidPrivate::Storage with out any luck.

i am on sdk 31 building app towards android 11 using qt, cmake,

UPDATE and clarify.

in my app i try and create a txt file to save JSON data it create a file on the device but i cannot open and write to the file. the error it gives is

<E Qt JAVA : openParcelFdForContentUrl: java.lang.SecurityException: Permission Denial: writing com.android.providers.downloads.DownloadStorageProvider uri content://com.android.providers.downloads.documents/document/62.txt from pid=2455, uid=10179 requires android.permission.MANAGE_DOCUMENTS, or grantUriPermission()>

and i have tried with the following permission request:

auto result = QtAndroidPrivate::checkPermission("android.permission.MANAGE_DOCUMENTS").result();
if(result == QtAndroidPrivate::PermissionResult::Denied){
    result = QtAndroidPrivate::requestPermission(QString("android.permission.MANAGE_DOCUMENTS")).result();
  }

any ideas ?

the whole file thingy:

 QString  filename = QFileDialog::getSaveFileName();
filename = filename + ".txt";
qDebug() << "the file name is : " + filename;
ui->startPageProgramName->setText(test.toString());
auto result = QtAndroidPrivate::checkPermission("android.permission.MANAGE_DOCUMENTS").result();
if(result == QtAndroidPrivate::PermissionResult::Denied){
    result = QtAndroidPrivate::requestPermission(QString("android.permission.MANAGE_DOCUMENTS")).result();
  }
QFile file(filename);
if(!file.open(QIODevice::WriteOnly)){
    qDebug() << file.errorString();
    return;
}else{
QTextStream out(&file);
out << "QString::fromStdString(mainPro_->programToString())";
qDebug() << &out;
out.flush();
out << "testing som more";
out << "agian";
file.close();
}