Hello Jennifer!
Are you inserting the video and the audio as separate files? When you insert a video, and use the video control seekbar, this will only work for the video portion.
If you need a seekbar that will work for both the video and audio, enable the seekbar for the slide by going to the Slide Properties:
You will want to disable the video controls for the video itself, which is found under the Options tab when the video is selected. You can turn off the video controls. Please keep in mind that when a video is inserted, it can still be clicked on and it will pause the video, and not the audio. You can add a transparent shape on top of the image to prevent this.
