This will open a window where you can navigate to the the Powerpoint Slide Album that you created in Keynote. Below the various new slide layouts is a list of three actions. On the Home tab, click the downward disclosure arrow next to the New Slide icon. In Powerpoint, select the slide after which the images are to appear. You have just created a Powerpoint Slide Album. Then Export this Keynote file to Powerpoint ( File > Export To> Powerpoint.). Copy and paste the images you want in Powerpoint onto the Keynote Light Table. Add one slide and then switch to Light Table view.
However, you can make your own Slide Album in Keynote* by opening a new Keynote file with a white background scheme.
One of the drawbacks of using Powerpoint on a Mac is that there is no Slide Album that will allow multiple images be inserted into the slide presentation the way you can in the PC version.