Assign document to variable by script

Hello everyone.

We currently have a Bonita process that is to print PDF customer reports, once printed they are uploaded to Bonita through a form and it is reviewed by other actors with Bonita before sending it.

I would like to be able to automate the loading of the file by the form by script.

I've been reviewing this document but I can't get the document to show up in the verification form: https://documentation.bonitasoft.com/bonita/2021.1/handling-documents

I tried adding an operation with this code but does't works:

import org.bonitasoft.engine.bpm.document.DocumentValue

def file = new DocumentValue ("C:\\Users\\lmachado\\Desktop\\Test.pdf")
return file