We are trying to understand how to upload a pdf into a folder and save the id in table to be retrieved later. We are not able to get the id to return and then save it. We have a response json and we can't just hardcode from the uploadfield. in the component containing the upload field we can't call from the process model that component. All the interfaces are nested and dynamic and contained in a dynamic json. Currently, attempting to create a process model for uploading the pdf has failed because we can't get the id back when the pdf is being stored in a folder.
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I'm a little fuzzy on your use case, but if you are trying to get the ID of a document from a!fileUploadField() where it is being selected on an interface, the form will need to be submitted to turn it into a document object before you can retrieve the ID, then you can use =document(pv!document,"id") in a script task, etc.
A common solution is to add a button which submits the form (this creating the document object), and chains back to itself, giving the user the impression that they never left the form.
Otherwise, please share a little more details on your use case, code, things you have tried etc.