To add a logo to your group that shows in the student course view shown below

Select the file manager, to have the file manager you will need to be a group manager

Create a new folder (1. below) and title it "Shared" (2. below) then select upload (3. below)

The following screen will appear:

Select add or drag and drop your logo then finish by clicking upload. 

PLEASE NOTE : The specifications for images must be in pixels and 300 X 120 otherwise the image will be stretched

To choose this file as your Logo, navigate to the course builder and select "provider details"

Then select "Edit"

The following screen will appear, select "choose file" 

This will open the file manager for you to choose your logo file.