I regularly give SharePoint presentations and demos and always had to improvise a bit to add demo content such as documents and videos. This is were the Microsoft Office 365 Demo steps in. I saved a selection of documents and videos for future presentations and demos. You can download these by clicking here.
Hope this is helpful for you.
Jasper Oosterveld is a Microsoft MVP and Modern Workplace Consultant from InSpark within the Netherlands. On a daily basis, he works with customers to implement the Modern Workplace with Microsoft 365. Jasper focuses on collaboration, communication, security, adoption and governance. Jasper loves to share is expertise and love for Microsoft products with everyone who is willing to listen.