A content management system allows a user to create a collection folder to which a submitting user can add content items without being able to access content items added to the folder by other submitting users. A collection folder is created in a namespace of a collecting user and folder is made available to multiple submitting users to allow the submitting users to add items to the folder. When a submitting user first request to store a content item in the collection folder, the content management system creates a sub-folder associated with the submitting user in the collection folder and stores the content item in the sub-folder. The submitting user is given rights to the sub-folder, but is not given rights to sub-folders created for other submitting users.