Server files repository
From Carleton Moodle Docs
What are server files?
The server files repository enables teachers and managers to access files used within a course and elsewhere on the site which they have permission to access.
Activity modules for which files are available in the server files repository are:
A search box at the top of the Server files screen allows those users with relevant permissions elsewhere on the site to search other courses for a required file. A teacher who teaches several courses for example can now quickly locate a document used in one of her older courses by typing its name into the Search field.
When a file from the server files repository is re-used elsewhere on Moodle, the teacher has the option to make a copy (a new, unconnected version) or to create a shortcut or alias. See Working with files for more details.
The capability View server repository, which is allowed for the default roles of manager, course creator, teacher and non-editing teacher, ensures that the server files repository is listed in the file picker. This capability should be allowed together with the manage files capability to enable users to access files used within a course.