Automatic Field Update (Filename in Footer) on Save?

[David Childers]

I've read online in other places that MS Word (using Office XP) should
automatically update fields like Filenames when a file is saved. It is
not working for me, however. I can get it to update if I hit, for
example, Print Preview, or the usual Select All + F9. I would really
like to do this automatically when we save to new filenames from a
template. I don't see any options under Tools--> Options to do this.
Any ideas?

Thanks,

David