Depending on the version of Powerpoint you have, there is an option to "save as" MP4 video.
As long as the MP4 is less than 100mb you can then upload this file in Optymyse using the "Local" tab of the video element.
Click and drag the video element onto a page, click the cog icon to configure, then choose "local" and upload the file.
For further information regarding saving a Powerpoint presentation as MP4 video please see this article from Microsoft:
Note: If you are using Chrome you may find that video does not autoplay to resolve this, please view this article: