Multiple dynamical attachments files

Hi,
how I can attach multiple files create dynamically before email is sent by form? I can’t use the field on email template in admin dashboard cause names of files always change.

Here’s the code of my function:

function my_wpcf7_function($cfdata) {

	$submission = WPCF7_Submission::get_instance();
	if ( $submission ) {
		$posted_data = $submission->get_posted_data();

		$mail = $cfdata->prop('mail');

                $mypath1 = full path file create dynamically
                $mypath2 = full path file create dynamically
                $mypath3 = full path file create dynamically

		$mail['attachments'] = ''.$mypath1.'\n'.$mypath2.'\n'.$mypath3.';

		$cfdata->set_properties(array('mail' => $mail));

	}

}
add_action('wpcf7_before_send_mail', 'my_wpcf7_function', 1);

Thank you for any helps.

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