Open the SharePoint Online site and upload the required ppt in Site Assets or any doc library. The ppt can be dragged and dropped to the library also. After the ppt is uploaded, click on the ... next to the ppt and click on Share Under Invite People, enter Everyone and uncheck Require Sign-in and click on Share Again click on ... and then click on guest link in 'Open to anyone with a guest link' Copy the url and open it in the browser. Click on File - Share - Embed Select the required dimension from the preview. Copy and save the code. Open the page where the ppt has to be displayed. Edit the page and click on embed code and paste the code. The ppt would be displayed on the page and the user can view it directly.
