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Click on a folder to expand the content, this folder contains lecture notes in a file (PDF) that can be downloaded and a document a web page that contains a recording of a lecture:
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Click on the item to viewa 
file, it will open in a layer above the course content area.
The following is a downloadable pdf, use the 
Ally button to generate an accessible version,
the 
download button to download the file
and 
to close the file
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Clicking on a 
document will also open it in a new layer above the Course content. Documents may contain text, images and video, they may also contain some downloadable files as well.
Use the Ally button to generate an accessible version
and to close the file
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