There is no UI to allow for attachments when you activate the startpoint. At that point in time you have not really started the process yet (until you hit the submit button) so I am not sure you will be able to accomplish this. As an alternative you coudl modify the renderer and put the attachments in the PDF.
Why don't you attach documents immediatelly after the workflow is initiated? (i.e programattically within your process)
This can be done at the start activity of your workflow.
Do you want the initiator to see the documents attached?
Yes Nith, you are correct - we want the initiator to see the attachments, and because of that, this would probably need to be done either in the prepare data or the render process. Since it's a Flex based form, PDF attachments are not an alternative, either.
If I try to invoke a component based function which adds the attachments inside the prepare data process I'm not getting any error. Still, they are not visible in the workspace. However, if the initiator manually adds an attachment himself, the other attachments become visible as well. Maybe the workspace app is missing a "refresh" or something?