email send using queue with attachment laravel
<?php
namespacde App\Mail;
use Illuminate\Bus\Queueable;
use Illuminate\Mail\Mailable;
use Illuminate\Queue\SerializesModels;
use Illuminate\Contracts\Queue\ShouldQueue;
class SendMailWithAttachment extends Mailable implements ShouldQueue
{
    use Queueable, SerializesModels;
    /**
    * Create a new message instance.
    *
    * @return void
    */
    public function __construct()
    {
        //
    }
    /**
    * Build the message.
    *
    * @return $this
    */
    public function build()
    {
          return $this->to('[email protected]')
              ->attach(storage_path('app/1569316022.jpg'))
              ->markdown('mail_example');
    }
}