There is no way to upload multiple documents for Human Task forms

At this time it is not possible to upload multiple documents in Human Task forms.

Customer wants to upload multiple documents without knowing how many documents user will upload.

Workaround proposed by engineering:

====
As a workaround I think you could wrap a Document on a Data Object (let's call it DocumentDataObject) and crate another Data Object (DocumentList) to hold a List<DocumentDataObject>. Then you could implement your own MarshallingStrategy to handle the persistence of DocumentList DO. I haven't tried this approach but I think it can do the work.
====