Gravity Forms to Asana (Zapier and files as attatchment)

We are using Gravity Forms (WordPress) and using Zapier to send form submissions to Asana.
So basically the Zapier set up are:
“On Forms submission → Create a Task in Asana”.

Its working fine however Im trying to add attachment as well but having trouble connect an uploaded file to a task as an attachment. There is an action called “Attaches a File to a task.” so it should work.

Any suggestions?