Tools\Mailer\Email::addAttachment PHP Method

    public function addAttachment($file, $name = null, $fileInfo = [])
    {
        $fileInfo['file'] = $file;
        if (!empty($name)) {
            $fileInfo = [$name => $fileInfo];
        } else {
            $fileInfo = [$fileInfo];
        }
        return $this->addAttachments($fileInfo);
    }