If you have been asked to share files (e.g. Turnitin receipt or feedback) with members of a 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 group to view. Other 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.