Can't change file name when creating 2d PDF for export

I have been trying to create a 2d PDF for export but the file? title name will not change and all files export as the same name. Any clues? Please note I am very new at this but have watched a few videos by Matt Lumbard (Good) & others but as far as I know I am setting the right commands etc.

If you are trying to do 2d PDF export, your trying to do it by creating a new Drawing. I get the dialog for saving different name in Drawing Mode. I get dialog when I export too.