If you have been asked to share files (e.g. Turnitin receipt or feedback) with members of a sub-group in the module please find it by going to My Groups in the module menu (left hand side) and click on 'File Exchange':

You can now name and upload your file for other students in your sub-group to view. Other sub-group members can view this content by also clicking on 'File Exchange'.  Any lecturers on the module will also be able to view any content posted here.