Prior to adding documents to the project, at least one root folder should be created to serve as a container for other folders (optional) and documents.
To upload a file to Project Documents
Navigate to your project.
On the project sidebar, choose Documents and open the Folders tab.
Navigate to the folder in which you want your file stored.
In the top right corner, click New and choose File:
From your file directory, select the file you want to upload.
Once the file is uploaded, you can change its name (title) and update it (upload a new version) at any time.