You can add Digital Material with the type of Booklet, Home Assignment or Notes. The digital material must be associated to Subject, it's subsequent Topic and Group. The file type can be (.pdf, .xls, .doc, .ppt, .png, .jpg, .jpeg).  If the Document type is Video Embed Url then use Iframe tags (recommended) or just the youtube video url.

To add Digital Material from Admin Panel, navigate to LMS section and click on 'Digital Material'. Then click on 'Add' button:
 

Then add the digital material as per your preference . Assigning Group is necessary to show the material to respective Candidates. Then click Save:

The Digital Material will be visible to the candidates on the Candidate Portal as shown in the screenshot: