The 'Download Filename' will be given to any file that is downloaded or exported via a menu action, i.e., user-driven.

The 'Export Filename' will be given to any file that is exported automatically via a workflow action, i.e., no user-interaction.

There are default filename settings already set up in this area. If you wish to change them, you can.

To change the default filenames, simply edit the text in the filename field.

To add 'variable' sections of text, use the drop-down menus on the right, as shown. Any variable will be placed at the cursor position in the appropriate field.