For your information, when importing a PowerPoint presentation into ActivePresenter, the inserted videos and sound in PowerPoint will be placed in the ActivePresenter Click Sequence timeline.
Take a look at this article to learn more about this timeline: How to Work with Click Sequence Timeline in ActivePresenter 9
If you want to preview the inserted videos and sound from PowerPoint in the main timeline of ActivePresenter, please follow the steps:
Click the ActivePresenter button > Preferences.
Click on the Miscellaneous tab of the Preferences dialog > select the Import PowerPoint animations to the main timeline option.