Attach pdf to email

I am getting crazy, with something very very easy.

$form->data['firmato_email']['path'] = JPATH_SITE . "/blablabla/" . $form->data['agg_pdf_firmato']['cf_pdf_file_firmato'];
$form->data['firmato_email']['name'] = $form->data['agg_pdf_firmato']['cf_pdf_file_firmato'];
$form->data['firmato_email']['link'] = JURI::root() . "images/firma_digitale/documenti_firmati/" . $form->data['agg_pdf_firmato']['cf_pdf_file_firmato'];

This is the debug:

    [firmato_email] => Array
        (
            [path] => /home/blablabla/50659a85f45eCYaDY7N9tjmDuiiNgq2V.pdf
            [name] => 50659a85f45eCYaDY7N9tjmDuiiNgq2V.pdf
            [link] => http://www.blablabla.it/blablabla/50659a85f45eCYaDY7N9tjmDuiiNgq2V.pdf

The links are correct...but if I add "firmato_email" in the field attachment of email events, it is not sending it.
Don't understand why, and I am sure it is something simple...😟

Hello enzo.orsi,
I'm not a Chrono professional, but after checking your new post, I think that the following links may help:
Attach PDF, XLS, CSV to email ? for both v4 & v5
How can I attach uploaded files to an email?
How can I attach files from my server to an email in CFv5
How can I attach files from my server to an email?
How can I attach a file I have created to an email?
P.S: I'm just an automated service😉