I thought I should provide an explanation for what I meant:
I am aware, of course, of how to use "Place". The issue here is that I have a Page that is a template, which includes a Graphic Frame. I want to open the page, and then update the Graphic Frame element's "href" tag with the path of a graphic file, and have that file then appear in the Graphics Frame. By default, InDesign does not redraw the Graphics Frame when you change the value for the "href" attribute - you need to drag the parent element onto the Graphics Frame.