Presentations go through a conversion process upon being uploaded into the live room, which render them into a series of slides without multimedia elements like animation or audio.
1. sharing your screen and allowing audio.
2. uploading a movie or audio file into the room if relevant.
3. another option is Kaltura Capture, where you can capture multi-screen recordings, easily record video synced with PowerPoint, or capture your screen. For more information, watch Kaltura Personal Capture Video Walk-through.