I'm a new user to captivae. I'm sorry I can't keep up with your terminology. I'm trying my best to learn. Perhaps you could explain in detail to help instead of just giving up. There is audio timeline. The background simulation slide, audio, and all shapes are present on the timeline it just wasn't in my video so I could give you a better view. You never specified that you needed that in the video. Frankly you're being mean when I'm really trying my best.
I think Lilybiri was just trying to establish whether you added the audio directly to the slide (i.e. slide audio) or to one of the objects on the slide (i.e. object audio). If you had to extend the slide length to accommodate the longer audio then it would seem that you did in fact add the audio to the slide.
However, in the video you sent with an earlier post that showed the issue it was not possible to see the audio on the timeline because that audio was in the row at the very top of the timeline layers. Is that correct?
In any case, whichever audio type you used, that should not be changing the appearance of your slide background.
My suspicion is that your slide background graphic has multiple layers. The movement you see is due to those layers. This is a fairly rare issue but it sometimes happens with Captivate when capturing screens where there are rollover effects (e.g. dialogs or tooltips that popup when your mouse hovers over some area).
Unfortunately its not always simple to resolve the issue because the layers are built into the graphic in much the same way animated GIFs can have multiple images on an internal timeline that then shows as an animation at runtime.
The quickest way to resolve these issues is usually just to recapture the image. But setting up the screen to exactly replicate pixel-perfect placement and zoom percentage may not be possible. So, if you are unable to find the background image in the Captivate library and extract it to some kind of image editing software that allows you to remove the layers, then the best option might be just to recapture the entire session. That's what I have usually done.