Drag and drop is an accepted and widely used method of attaching files within web-based interfaces. SBM should allow drag and dropping a file on to an item's form to perform the "Add Attachment" function that is right now only available through the Actions button.
On Transition Forms, this could be handled in such a way that dragging a file on to the form will attach the file to the item but a File field would have a designated area that a file could be dragged to, enabling drag and drop for File fields.
When a file is dragged, a modal dialog should display prompting the user for the options that we provide on the existing file attachment UI such as Attachment Name, Restricted / Unrestricted, etc.
This would improve accessibility with some users having challenges clicking buttons to navigate tools as well as improve the usability and removing button clicks.