How to "attach a copy of your broker's statement or other documentation showing the taxes paid to the other country"

TurboTax Desktop indicates for my Arizona (AZ) state taxes:

"For foreign countries, attach a copy of your broker's statement or other documentation showing the taxes paid to the other country."

 

I can't find where to attach them to get submitted with my state efiling.

 

The Edit | Add Supporting Details

and

Tools | Attachments menu options are both disabled.

 

How do i attach my supporting document?