You can share any type of content that has been uploaded to Google Drive or Google Classroom.

In order for others to see your embedded content (such as Docs, Slides, Sheets or videos) you must change your sharing settings.

The easiest way to do this is to:

1. On the file you want to embed, click "Share"

2. Change to "Anyone with the link can view"

3. Press "Copy Link"

4. Back on Google Sites, click "Embed" and paste in the link that you copied.