Hello, 2 ways for you:
way 1:
1. Put the sound files and the PowerPoint presentation in a same
folder.
2. Reinsert the sound file to the PowerPoint presentation.
3. Package the entire folder into one archive file and upload it.
way 2:
Music in each format can be embedded in PowerPoint if you use right
trick.
To wav sound larger than 100KB:
PowerPoint-> Tools->Options-> Advanced -> link sounds with file size
greater than ...KB. Please input 50000.
To MP3 or other formats:
Convert your PowerPoint presentation to Flash use some third party
presentation tools, Acoolsoft ppt to flash (
http://www.acoolsoft.com/
powerpoint-to-flash-overview.html#110 ), for instance. It can help you
convert your ppt to flash movie with all the sound files embedded .
You can upload the Flash-based without any hassles.