Multimedia material refers to material that cannot be included in the PDF of your thesis. It usually consists of electronic material such as audio/video files or data files that are part of or are relevant to your thesis.
While cIRcle can technically accept most file formats, preferred formats are those that we have the most capacity to support for access and preservation. It is important to understand that submitting anything other than preferred file formats may result in a failure of long-term preservation and access to your thesis or dissertation. Please see Library:Circle/File Format Guidelines for information.
Note re. .zip files: .zip files create accessibility barriers for people using screen readers. It is highly recommended that .zip files are only used when necessary