The slide above is only an Example of what you can do with Google Slides and Google Sites. Embedding or Inserting a Google Document into a Site makes it easy to Share Info. If you are an Editor or Owner of the Slide, whenever you make changes in Google Drive it will Auto-Magically appear in sites because they link to the same file. So there is no need to re-upload your changes. Everyone just goes back to the same page in your Google Sites for the latest up-to-date version.