Add things from your Google Drive to your Google Site. Watch the video and/or follow the instructions to the right to add a document, a PDF, and a Google Slideshow to your Google Site.
#6 Upload from Drive.webm
In the upper right corner, click on "Insert"
Click on "From Drive"
Select all of the items that you want.
Click on Insert
Make sure your sharing settings allow access to the items you are sharing.
Don't forget to click on "Publish" when you are finished updating your site so that your changes apply to your finished site.