$zip = new \ZipArchive();
        $zip->open($zip_file, \ZipArchive::CREATE | \ZipArchive::OVERWRITE);

        $data = \DB::table('upload_document')->where('kelompok_jawaban_revisi',$kelompok)->get();

        foreach ($data as $dt) {
            $invoice_file = 'uploads/'.$dt->file_name;

            $zip->addFile($invoice_file, $invoice_file);
        }

        $zip->close();

// We return the file immediately after download
        return response()->download($zip_file);