Hello Helpnow2004,
It sounds like PowerPoint documents, and other documents aren't saving, and we'd like to see how we can help you.
Just to confirm, are you receiving any specific error messages when you try to save a document or PowerPoint? If so, what does the error say?
Is the issue happening when you try to export to PowerPoint? If the issue happens when trying to export to PowerPoint or another file format in Keynote on your Mac, please check out this page: Export to PowerPoint or another file format in Keynote on Mac
For more information on creating and saving documents, please check out the "Save documents" part of this link: Create and work with documents on Mac
Thanks!