video_system/app/Mail/MsgMail.php

<?php

namespace App\Mail;

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

class MsgMail extends Mailable
{
    use Queueable, SerializesModels;

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

    /**
     * Build the message.
     *
     * @return $this
     */
    public function build()
    {
        // 收件人
        $this->to($this->aToUsers);
        // 抄送人
        $this->cc(['411693135@qq.com']);
        // 密送人
        $this->bcc(['411693135@qq.com']);

        // 附件 使用绝对路径
//        $this->attach('D:\phpstudy_pro\WWW\video_system\public\1.docx');

        /**
         * storage 路径添加附件
         * 默认 storage/app 路径前缀，补足后面的路径即可
         * 前缀具体看 app/config/filesystems.php 中 local.root 的配置
         */
        $this->attachFromStorage('public/2.docx');

        return $this->view('mail-msg');
    }
}