Collaboration in Discussions is designed around Topics where participants can express their thoughts on the defined subject.
Once you find and select Discussion, you gain access to its tabs: Topics, Documents and Images.
You can add your own Topic with button Start new Topic or choose existing Topic and collaborate by adding comments, attaching files with + sign. or mentioning people with the @ sign. All added files will be shown in Document or Images tab regarding the uploaded format of the file.
You can directly add documents related to the Discussion in Document tab. Trey will be also shown on the right side of discussion page view in section Latest discussion files.
Note: All relevant file formats are supported.