In the Virtual Classroom, there is a drop-down menu available in the whiteboard area. 

You need to use that option to use content in the class. 

Please follow the step-wise process mentioned below: 

1. Select New option in the menu and click on Content to access your content library. 


2. Choose a file from the Library


3. See preview and share (remember to click on the Share icon  to share. Until you share, the attendees won't be able to see the file)