Many teachers use Google Drive (Docs, Sheets and Slides) for everything.
Rather than converting these to PDF, teachers can add these to their Lesson Library for future use in classes.
That means students can, not only view the files, but even edit these materials if provided with the necessary permissions.
From inside the virtual classroom, click + icon on the right to open the Lesson Library
Choose Google Drive Link from the options
Paste the Google Drive link here (including the https://...)
Then you'll be able to view and work together on the Google Doc from inside the whiteboard (depending on the permissions.
Please watch this short YouTube video for more thorough instructions.