Your locker is a place to collect documents, essays, and other demonstrations of your high school work (for example, videos or music files).
We recommend you think of it as a resource for saving high school work you are proud of. Once you attach an item to an application from another source, such as uploading it from your laptop, a copy is saved in your locker so you can easily access it again if needed.
During the college application process, you may be asked to attach various documents (such as an essay or work sample) to your application. If you have saved and curated a collection of these items in your locker throughout high school, it will be easier to view and add items to your application when requested.