I tried to copy a diagram. I selected menu "Edit" then "Copy" and then clicked confirmation button "Copy". But now I do not see any copied item in the diagram overview.
Most likely you do not see the copied items, because the overview of the diagrams in Signavio Explorer does not reload automatically after this action. Please just click the button "Refresh" on the top right corner or press the F5 key on the keyboard and you will be able to see new content.
KBA , BPI-SIG-PM-EXP , Explorer for SAP Signavio Process Manager , How To