You can upload additional materials to any course (compendium, study materials, presentations, etc.). Any file should be no more than 25 mB.
You can upload files in the side menu of the course settings:
As well as in the lesson settings:
In order to make the materials available for learners, you need to insert the link to the attached document to the proper step of the lesson (please copy the link using the right mouse button).
OR
Please notice that when you give a link to the Stepik page or a file uploaded there, the link will open in the same window. If it leads to an external site, it will open in a new window.