laravel5.6 使用mail发送附件邮件

模型：

<?php

namespace App\Mail;

use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Mail\Mailable;
use Illuminate\Queue\SerializesModels;

class SendMail extends Mailable implements ShouldQueue
{
    use Queueable, SerializesModels;

    /**
     * Create a new message instance.
     *
     * @return void
     */
    private $data;
    public function __construct($data)
    {
        $this->data = $data;
    }


    /**
     * Build the message.
     *
     * @return $this
     */
    public function build()
    {
        return $this->view('emails.common')
                    ->subject('测试邮件')
                    ->attach(storage_path($this->data['file_path']), ['as' => $this->data['file_name']]);
    }
}

控制器：

public function sendMail()