NOTE : Script provided here is only on an "AS-IS" basis. Workflow customization is out of scope of support .
Workflow code can be used to disable the action of the “Save As” button.
The code must be implemented in "ActionCanExecute" subroutine after the following line:
ActionCanExecute = DefaultRes
Here is the example code which checks whether the button was clicked and disables its action:
if (actionname = "Attachment.Save" or actionname = "attach__download_save") then
ActionCanExecute = false
Users need to include this logic in their workflow and enhance it as per the need. The script is just a example and not a complete solution.