As a stakeholder on a process or value stream; you can move tasks, notes and attachments from one activity to another. The activities have to be in the same process or value stream.
To move the attachment from one activity to another, click on the edit button next to the attachment title. The update pop up will appear. Here you can change the activity the attachment will fall under by selecting a different activity from the drop down list.
Tasks and attachments can be moved from one activity to another. Notes can be moved between activities and decisions. Process links are not included in the lists for attachments to be moved to.