OSGI Workflow attachment list on Assign Task

Hello,

I am trying to understand how to pass Attachments from one Assign Task to another. 

On the submission, I can see that I can add a Variable Array of Documents.  That works, all is good.

However, on the subsequent Assign Task, in the pre-populate section, I do not see the ability to assign a Variable Array to the prepopulation.

Does this mean that we must write the document Array to the payload?

Actually, that wouldn't work because we can only attach one document to the Prepopulate in Assign Task.

If somebody could explain this to me, it would be great.

Thanks,