laravel 5.4来自用户输入的电子邮件附件文件

Question

I want to attach file on email from user input files on application form, but I dont know hot to do it properly. I tried this code but the attached files are invalid files(pictures, pdf etc..) when opening after downloading the attached files. Here is my code

public function __construct(Request $request, Position $position)
{
    $this->request = $request;
    $this->position = $position;
}

/**
 * Build the message.
 *
 * @return $this
 */
public function build()
{
    $email = $this->from('[e-mail]', $this->request->first_name . ' ' . $this->request->last_name)
        ->replyTo($this->request->email, $this->request->first_name . ' ' . $this->request->last_name)
        ->subject('Application for ' . $this->position->name)
        ->view('emails.application');


        $counter = 1;
        foreach($this->request->resume as $resume) {

            if ($resume->isValid()) {
                $path = $resume->path();
                $extension = $resume->extension();

                $email->attachData($path, 'file' . $counter. '.' . $extension);
            }

            $counter++;
        }

    return $email;
}