PowerPoint presentations are added to Versal using Versal's OneDrive gadget. The OneDrive gadget is located in the "viewers" section of the gadget tray.
You will need a OneDrive account in order to embed a PowerPoint. First, upload your PowerPoint to your OneDrive account. Then copy the embed code that Microsoft provides.
Copy the embed code that Microsoft provides. Don't worry about choosing an embed size, you will size the PowerPoint in Versal. Add the OneDrive gadget, then click the gear icon and paste the embed code in the embed field.