Attachments can not be sent out through email

I am trying to send an email with attachment from my android app. But the email somehow goes out without the attachment, even though the file exists. In the email sending view, it shows the attachment (with file size even), but after sending, on the receiver side, there is no attachment. Any idea why?

private void copyFileToExternal() throws IOException {
    try {
        File sd = Environment.getExternalStorageDirectory();
        File data = Environment.getDataDirectory();

        if (sd.canWrite()) {
            String currentDBPath = "data/com.dw.inspectionhelperNSTC/databases/Inspection.db";
            String backupDBPath = "Inspection_backup.db";
            File currentDB = new File(data, currentDBPath);
            File backupDB = new File(sd, backupDBPath);

            if (currentDB.exists()) {
                FileChannel src = new FileInputStream(currentDB)
                        .getChannel();
                FileChannel dst = new FileOutputStream(backupDB)
                        .getChannel();
                dst.transferFrom(src, 0, src.size());
                src.close();
                dst.close();
                Toast.makeText(getBaseContext(), "testing", Toast.LENGTH_LONG).show();
            } else {
                Toast.makeText(getBaseContext(), "not exist", Toast.LENGTH_LONG).show();
                System.out.println("currentDB does not exists");
            }
        } else {
            Toast.makeText(MainActivity.this,
                    "NO SDcard so unable to send the database backup",
                    Toast.LENGTH_SHORT).show();
            System.out.println("sdcard cant write");
        }
    } catch (Exception e) {
        Toast.makeText(getBaseContext(), "error", Toast.LENGTH_LONG).show();
        System.out.println("exception" + e.getLocalizedMessage());
    }
}

private void sendEmail(String email) {
    ArrayList<Uri> uris = new ArrayList<Uri>();
    // Adding the inspection DB;
    File file = new File(Environment.getExternalStorageDirectory(),
            "Inspection_backup.db");
    Uri path = Uri.fromFile(file);
    uris.add(path);
    // Adding the stacttrack file with uncaught expection
    File file2 = new File(Environment.getExternalStorageDirectory(),
            Constant.STACKTRACE_FILE);
    Uri path2 = Uri.fromFile(file2);
    uris.add(path2);

    Intent intent = new Intent(android.content.Intent.ACTION_SEND_MULTIPLE);
    intent.setType("application/octet-stream");
    intent.putExtra(android.content.Intent.EXTRA_SUBJECT,
            "inspection database");
    String to[] = { email };
    intent.putExtra(Intent.EXTRA_EMAIL, to);
    intent.putExtra(Intent.EXTRA_TEXT,
            "sending inspection database for reporting");
    intent.putParcelableArrayListExtra(Intent.EXTRA_STREAM, uris);
    startActivityForResult(Intent.createChooser(intent, "Send mail..."),
            1222);
}