This area of the dialog box is for setting the destination directory where files will be placed. It contains these items:

This display shows the path to the currently selected destination.

This display shows how much disk space is available on the destination volume.

This is a scrollable list of files in the current directory. Double-clicking a directory or volume in the list displays the contents of that directory or volume.

Pressing this button closes the dialog box without performing the copy operation.

Pressing this button starts the copy procedure. You are first prompted by a notice to verify the destination directory. Once you verify this, the copy proceeds.