Multi DVD backup of files - where are the instructions

Setup: Freshly updated Acronis home. Attempting a backup of files that will require
multiple DVDs to hold.

So far I've gone to the main page, choose "File backup". Once there, using the hyperlink at the bottom, "File backup options", I select "Backup Splitting".

There I have used both the static DVD at 4.7 setting and Automatic. In neither case do see how to get beyond the first disc and be sure I'm not just burning the same data over and over.

There is never any message on the screen indicating I should insert a new disc. Nothing whatsoever to indicate what is expected of me other than the disc I originally had inserted is slid out on the CDROM tray.

Should I be seeing something to indicate what is going on, or at least what is expected of me?