When I try to use the Form Field Field layer on a new form, the forms I've dragged and dropped into the layer don't show up on the new form.

I created a Form Field Layer:

Added a lot of signature fields on this the form field layer on page 3:

But when I go to Send to send a new document, and try to select the Form Field layer that I created, none of these Form Fields show up on the new document. Am I misunderstanding this feature?

Thanks