Please ensure that your Windows Updates and Microsoft Updates are all fully updated.
Download the attachment and run the pptchecker.exe to confirm compatibility and PowerPoint version.
If you are uploading content and ".ppt and .pptx " are not an available media file type, then you may need to do the following.
First, download the attachment and run the pptchecker.exe to confirm compatibility and PowerPoint version.
If not supported , please follow below article to configure your computer settings.