This mockup shows how a websites assets such as photos can be uploaded. It shows an overlay page with a background page where the user is logged into the content management system. 

 

The user must click the large + button  to browse and upload a photo to the photo library. 

 

The wireframe can be used for all types of libraries such as video libraries and document library.

 

It is used to explain to customers how a document content mangement system works.