You’ll find your lecture notes, learning materials in Course Content view, the default page in your Blackboard course.
...
Another symbol you will see is 
this represents integrated non-Blackboard software e.g. Turnitin (assignments), Vevox (polls & quizzes) or Matlab (data)
Folders, documents and files
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:
...
Use the 
Ally button to generate an accessible version
and 
to close the file
...
...