Yeah, no problem. But there are some additional configuration steps.
Copying a "Presentation from Media File" webinar to use as a live webinar
Within Interface Builder
1. Add the component Presentation.
2. After adding the Presentation component, rename the Media Player from "Presentation from Media File" webinar to "Media Player" within Properties.
Copying a webinar without a Media File to create a webinar of type
"Presentation from Media File"
Within Interface Builder
1. remove the component Presentation
2. Rename Media Player component to Presentation
3. Update Media Player Size to 640 x 360