How to use Copilot Agents in SharePoint [All You Need To Know]

Hello, I understand that every new SharePoint comes with a Copilot Agent grounded on the entire site. I created a new page with an embedded PPT deck and I stored the file in my SharePoint's Documents folder. However, my agent is having trouble pulling info directly from the PPT when prompted. How can I add this PPT file to my agent's grounding?

Thanks! GiulianoDeLuca