Broken xlsx file in attachment sent by swiftmailer smtp Yii2

I am sending an email with an attachment using Yii2 and Swiftmailer. When I try to open a file in my Google account, Google writes that the file is damaged. I tried to download the file and open it, but my excel also told me that the file is damaged.

BUT, I tried to open the file before sending, and it opens perfectly. I also tried to send the file through my email client and then the file also opens up nicely.

I tried using different SMTP servers, nothing changes.

What could be the problem?

I enclose the code.

'mailer' => [
        'class' => 'yii\swiftmailer\Mailer',
        'transport' => [
            'class' => 'Swift_SmtpTransport',
            'host' => 'XXX',
            'username' => 'XXX',
            'password' => 'XXX',
            'port' => '465',
            'encryption' => 'ssl',
        ],
    ],

and

$emailManager = new EmailManager();
$mailer = $emailManager->actionSendfile($address, $filename, $subject, [
    'contentType' => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
]);

and

public function actionSendfile($to, $filePathArray, $subject, $options = [])
{
    $send = Yii::$app->mailer->compose()
        ->setFrom(['noreply@example.com'])
        ->setTo($to)
        ->setSubject($subject)
        ->setHtmlBody("Some text");

        if(is_array($filePathArray)){
            foreach($filePathArray as $value){
                $send->attach($value, $options);
            }
        } else {
            $send->attach($filePathArray, $options);
        }


        return $send->send();
}