Please create a course resources bank, similar to the lessons and questions banks. Sometimes the same resources are used for multiple courses and it would be great not to have to have to re-add them each time. I know about the Global Resources but these add the resources to the LMS as a whole and not to a particular course.
There is a way to do this currently. You can open any course and go to the resources part of the settings. Click to open the file manager. Upload the content you want to be able to use as a shared resource. That adds it to the file manager, which means it can be selected as a resource anywhere on the system. You can then exit the file manager without selecting anything and cancel out of the course you opened without saving any changes. The course you opened hasn't had any changes made and the resource is now available to use for however many courses you like. Hope that has helped!