In larger and more complex ERD diagram with many Diagram Views there is no option to export all Diagram Views at once, and a filename is generated automatically.
In practice, this means creating an export for each diagram and then manually renaming it to a logical name.
It would be a useful addition if functionality were added allowing you to export all or selected diagram views to one or more export formats at the click of a button. Furthermore, there should be an option to have the file name taken from the name of the Diagram View.