Download Manager issue in Samsung S6 model. how to fix this issue?

Question

I'm downloading the .txt, .doc, .pdf etc files from my android application. Its working fine in all devices but I'm unable to download the files in S6 device.

I have used the following code let me know if any changes/modification required.

    DownloadManager.Request request = new DownloadManager.Request(
                            Uri.parse(url));
    request.setDescription(arrayList2.get(arg2).get(
                            "doctypedesc"));
    request.setTitle(arrayList2.get(arg2)
                            .get("docfilename"));

    request.setDestinationInExternalPublicDir(
                            Environment.DIRECTORY_DOWNLOADS, arrayList2
                                    .get(arg2).get("docfilename"));
    DownloadManager manager = (DownloadManager)getSystemService(Context.DOWNLOAD_SERVICE);
    manager.enqueue(request);