Process Multiple Files in Photo Editor greyed out

[A5EC0]

I am trying to use the Process Multiple files function within the Photo Editor.  However, when I open the program, this option under the file menu is greyed out.  This is to say, I cannot select this option under the File menu that will bring up the dialog box.  Even more frustrating is that on some occasions this works as intended.  Can anyone explain what is going on?

[Jeff Arola]

You need to be in Expert mode.

[A5EC0]

Thank you.  An embarrassing oversight from a PSE newbie.