From Carleton Moodle Docs
Repositories in Moodle enable users to add files to a course and other locations in Moodle. Repositories provide access to specific types of file sources. They can also allow, where appropriate, users to upload files, access previously uploaded files, and to easily bring content into Moodle from external sources, such as Flickr or Google Docs.
Repositories are managed in Site administration > Plugins > Repositories > Manage repositories. Standard repositories come with default Moodle. It is also possible to add additional repositories via Moodle plugins.
Repositories enabled by default
- Embedded files - Allows linking to files and images available to the user that have been added/embedded in their course activities
- Server files - Gives access to files elsewhere on the Moodle site (limited by a user's permissions)
- Recent files - Shows the last 50 files you have uploaded, according to the context
- Upload a file - Enables the "Upload a file" option in the site File picker to allow users to browse for and upload files
- Private files - Enables access to a personal storage area for every user
- URL downloader - Allows downloading of files and images from a particular URL
- Wikimedia - Let's users search for and insert media (images) from Wikipedia
Additional standard repositories disabled by default
These may be enabled and set to visible or hidden by a site administrator.
- Dropbox - link to or copy files from Dropbox
- File system - access files uploaded to a folder on your server (by, eg FTP)
- Google Drive - bring files from your Google Drive account
- YouTube videos - search for and display YouTube videos