Navigate to the Assessment and select "Candidates" from the menu on the left. Here you can upload candidate-specific files in PDF, PNG, JPEG, MOV, MP4, DOCX and PPTX format. This enables documents such as resumes, photos, and videos to be uploaded to the administration interface and then be directly available to you in the observer interface.
You can also add a profile picture of the candidate as a JPG or PNG file. To do so, click on "Add file" in the top-right corner of the "Basic Information" section to upload the desired image.