Question

2) there should be a what between the foreground objects and background slide​

Answer 1

Answer:

Cue

Explanation:

You can add a cue to change the Background--video or still image--to the cue. This background "cue" will be played on the video playback layer, which is between the background color and the slide layer. ... Further, if a slide is triggered while a foreground video is playing, it will clear the video.