$mail = Loader::helper('mail');

$f = new Concrete\Core\Application\Service\FileManager();
//...
echo $f->file('file', 'test', 'pls choose');

$files = $this->post('test');
$file = \File::getByID($files);

$file = \File::getRelativePathFromID($files);

$mail = Loader::helper('mail');
        $mail->setTesting(false);
        $mail->setSubject('test-subject');
        $mail->to($this->post('uEmail'));
//...
$attach = $mail->addAttachment($file);
        $attach->filename = 'tttt';
        $mail->sendMail();

call_user_func_array() expects parameter 1 to be a valid callback, class 'Concrete\Core\File\Version' does not have a method 'getPath'

namespace Concrete\Core\Mail;
//...
class Service {
//...
/**
      * Add attachment to send with an email.
      *
//... example
      *
      * @param File $fob File to attach
      * @return StdClass Pointer to the attachment
      */
public function addAttachment(\Concrete\Core\File\File $fob)
    {
         // @TODO make this work with the File Storage Locations