When clicking export on a Mac there is no type option drop down in the Save As finder window as there is in windows explorer Save As window. This is a discrepancy in how the two OSs handle file saves based on what was supplied by the app.
Right clicking on a Mac gives no change in the app or in the Save As dialog window.
Also how would one right click on an iPad or a modern phone ;)
It would be nice for the devs to move this type selection from the OS into the app where the export button was a dropdown with types available.