Watch: files and the required home page pieces
A later part of the home-page walkthrough: image credit, audio, the thesis, and saving before preview.
Later in Starting Your Website: A Walkthrough, the page picks up the pieces a home page needs and then saves.
The example centers a title and Auto-Nav, a primary source quote, an image with its source credit, an MP3 with its source credit, and a thesis. Preview is how you check that those pieces are on the page a visitor sees.
Upload steps are in Images, sound, video, and buttons. Click Save before you leave. The green Saved box means the page kept the work.