Hi @gil123 the easiest workaround to do this would be to create a custom property using the file field type. Then you could populate the file per user and access this property via the email using personalization token to provide the URL for the file.
I am not sure this workaround fits my use case. I’ll try to elaborate -
the file I want to send is dynamic, and on-demand, for example, when a user wants to get an email with an invoice for a purchased product - this request creates the invoice behind the scenes and then sends it to the user.