attach pdf mail cakepdf with tcpdf - tcpdf

Question

hello community I don't know how to attach a pdf generated with tcpdf to a mail using the cakepdf plugin in cakephp 4 here my action of the controller that sends the mail
public function register()
{
$names = $doctor->name.' '.$doctor->last_name;
$dir = new Folder(WWW_ROOT.'register'.DS.$doctor->code_cmp, TRUE,0775);
//this function generates the pdf
$this->generatepdf($names,$doctor->specialty,$dir->path);
$email = new Mailer('blue-profile');
$email->setEmailFormat('html')
->setViewVars([
'names' => $names,
'specialty' => $doctor->specialty,
'user' => $doctor->code_cmp,
'password' => $this->request->getData('password')
])
->setFrom(['info#expertosaplv.pe' => 'Abbott'])
->setTo($doctor->email)
->setSubject('Bienvenido APLV Expertos Pediatras')
->viewBuilder()->setTemplate('welcome')->setLayout('default');
if($email->send()){
$message['success'] = "success";
echo json_encode($message);
die();
}
}
function that generates the pdf
public function generatepdf($names,$specialty,$dir)
{
$this->set(compact('names','specialty','dir'));
$this->viewBuilder()->setClassName('CakePdf.Pdf');
$this->viewBuilder()->setOptions([
'pdfConfig' => [
'margin' => [
'top' => 0,
'bottom' => 0,
'left' => 0,
'right'=> 0
],
'orientantion' => 'portrait',
'download' => false,
]
]);
}
here my template that from the pdf
require_once(ROOT.DS.'vendor'.DS.'tecnickcom'.DS.'tcpdf'.DS.'tcpdf.php');
require_once(ROOT.DS.'vendor'.DS.'tecnickcom'.DS.'tcpdf'.DS.'config'.DS.'tcpdf_config.php');
class PdfInvitation extends TCPDF{
public function Header() {
$bMargin = $this->getBreakMargin();
$auto_page_break = $this->AutoPageBreak;
$this->SetAutoPageBreak(false,0);
$this->SetAutoPageBreak($auto_page_break,$bMargin);
$this->setPageMark();
}
}
$img = WWW_ROOT.'img'.DS.'fond-pdf-notify.jpg';
$pdf = new PdfInvitation('P',PDF_UNIT,PDF_PAGE_FORMAT,TRUE,'UTF-8',FALSE);
////code pdf
$pdf->AddPage();
$pdf->lastPage();
$file = $pdf->Output('Diplomas-Eval-SER.pdf', 'S');
//I saw this code in the plugin documentation
$CakePdf = new \CakePdf\Pdf\CakePdf();
$CakePdf->template(DS.'Doctors'.DS.'pdf'.DS.'invitation','invitation');
$CakePdf->write($dir.DS.$file);
Maybe I'm doing something wrong, I would appreciate your help.