How queue email in a job with attachment laravel

I have created a queue job to send email to my batch of users it works fine when I send an email with an attachment. But when I add the file to queue I get an error that says unable to serialize content.

and here is my code

$emailJob = (new SendNewsletter($id, $request->flag, $attachments))->delay(Carbon::now()->addSeconds(3));
        dispatch($emailJob);

via Chebli Mohamed