ModX: How to send an attached file in formit?

Question

MODX

Good afternoon. The task is this: you need to send the attached image to the client after filling out the form to his email address. In the form itself, there should not be a field for adding a file.
How can this be solved on modx?

Answer 1

I wonder how to attach a file without having an attachment field?
where does the file come from?

Answer 2

I meant there is no tag in the form <input type="file" />. That is, an attach file is needed. This is implemented differently in different frameworks. I don't know about modx. It is necessary for each client who filled out the form with their data to send a coupon with a discount.