how do i create a common folder under internal storage's Downloads folder from android version 5 to 11.

[NIvil Wilson]

sir,
how do i create a common folder under internal storage's "Documents" folder from android version 5 to 11.
i used the following code to create folder but it doesn't work on android version 5 without an sdcard.

  QStringList pathlist=QStandardPaths::standardLocations(QStandardPaths::DocumentsLocation);

   QString path=pathlist.first();
   qDebug()<<path;
       QDir dir(path);
   QDir dir1(path+"/ksl");

       if(!dir1.exists()){
           qDebug()<<dir.path();
           bool status=dir.mkpath(path+"/ksl");
           qDebug()<<status;
           qDebug()<<dir.path();
           qDebug()<<dir.currentPath();

       }