For example, given a PowerPoint file with 30 slides, if you record the first 10 slides in the 30 slide file and export that file, your video will still show all 30 slides in the video even though only the first 10 have audio with them. NOTE: If you are breaking a longer presentation down into smaller chunks, you will need to save each chunk as a separate PowerPoint file to make sure each video only contains the slide you want to include.