insert general file with MediaStore

gistfile1.java

Context context = view.getContext();
ContentResolver cr = context.getContentResolver();
ContentValues values;

try {
    // create a file for test
    File file = new File(context.getFilesDir(), "1234568");
    file.createNewFile();
    try (OutputStream os = new FileOutputStream(file)) {
        os.write("test".getBytes());
    }
    
    values = new ContentValues();

    String displayName = "test_" + System.currentTimeMillis() + ".txt";
    if (Build.VERSION.SDK_INT >= 29) {
        // RELATIVE_PATH is limited, e.g., for MediaStore.Downloads the only option is DIRECTORY_DOWNLOADS
        values.put(MediaStore.MediaColumns.RELATIVE_PATH, Environment.DIRECTORY_DOWNLOADS + "/test");
        values.put(MediaStore.MediaColumns.IS_PENDING, true);
    } else {
        // on lower system versions the folder must exists, but you can use old-school method instead ("new File")
        values.put(MediaStore.MediaColumns.DATA, Environment.getExternalStorageDirectory() + "/" + Environment.DIRECTORY_DOWNLOADS + "/test/" + displayName);
    }
    values.put(MediaStore.MediaColumns.DISPLAY_NAME, displayName);

    Uri target;
    if (Build.VERSION.SDK_INT >= 29) {
        target = MediaStore.Downloads.EXTERNAL_CONTENT_URI;
    } else {
        target = MediaStore.Files.getContentUri("external");
    }
    Uri uri = cr.insert(target, values);
    if (uri == null) {
        return;
    }
    
    InputStream is = new FileInputStream(file);
    OutputStream os = cr.openOutputStream(uri, "rw");
    byte[] b = new byte[8192];
    for (int r; (r = is.read(b)) != -1; ) {
        os.write(b, 0, r);
    }
    os.flush();
    os.close();
    is.close();

    if (Build.VERSION.SDK_INT >= 29) {
        values = new ContentValues();
        values.put(MediaStore.Images.ImageColumns.IS_PENDING, false);
        cr.update(uri, values, null, null);
    }
} catch (Throwable tr) {
}