With v.5.* we used to handle attachment of multiple files to a process and multi instanciatite an activity based on the resulting list of documents.
To achieve this we had to use a variable with the type attachment set to be multiple, and then save the output of multiple file widget in this list.
So far so good.
It happens that, with v. 6, the document abstraction provided in replacement to attachment type does not expose multiplicity.
How to get that feature working with v6 ? That is the question.