Email Campaign not sending attachments

Installed:
ERPNext: v12.19.0 (version-12)
Frappe Framework: v12.16.3 (version-12)

Hello all,
As mentioned in the subject, the email campaigns that have attachments, are sent out just without them.
The attachments are public, not private; email account is set correctly and Scheduler is enabled.
What do you think I missed?

Cheers