Hi, Rob – currently there’s no “easy” way to do it that I know of. But there is a work-around, although it will take a little time to do the set-up (but easier than doing a copy/paste for each slide afterwards). Open a new slide show and place one image along with the placeholder, AND assign the image the “Is Placeholder” attribute (right-click on the image to get File > Is Placeholder). You should also be able to assign an attribute to that slide (like fit to stage, fill layer, fit to layer, etc.) Now copy that slide (that includes both the image and text placeholde layers), and paste as the next slide. Then copy those TWO slides and paste again. Now copy those FOUR slides and paste again. Then copy those EIGHT slides and paste again. You get the idea, right? You’ll quickly have a slideshow where each slide is a placeholder and the text is the . NOW save that slideshow as a SNIPPET, and name it what you want. Now start a NEW slideshow and drag in the snippet. And then select all the images you want to use from the image browser and drag them to the timeline, starting at the first slide. They SHOULD come in, one each, replacing the placeholder image with the new image – AND – the filename will appear in the text placeholder.
It’s NOT an “easy” method, per se, but it works. And you’ll probably have to make a few adjustments to each slide (if necessary) depending on your settings for how the placeholder’s properties were originally assigned.