The specific steps of adding music and video to PPT are as follows:

The materials we need to prepare are: computer and PPT slides.

1. First, we open the PPT slide to edit, click "Video" in the insert and select "Video in File".

2. Then we click the video we want to insert in the pop-up window, and then click Insert to join the video.

3. Then we click "Audio" in the open insert and select "Audio in the file".

4. Then we click the audio we want to insert in the pop-up window, and then click Insert to add audio.