As you assemble a photo book you often want to swap images, move them around, try new combinations, etc. Ultimately it's a very iterative process. I guess I was surprised when I initially "imported" a batch of images and the Place Image panel disappeared as soon as I selected another tool. Intuitively, for me at least, I thought I could go back to it as needed to select/choose various images as I built the book, adding pages, moving pages around, etc. So my original question was to know if there was a way to do that inside Publisher vs toggling between Publisher and the OS file folder window, it seems to be the latter.