Adding a user context allows the users in the container to access the share.
In UMC, click File Access Protocols > CIFS > User contexts.
Click Add user context.
In the Add user context wizard > Servers, select the servers from the directory tree and click Next.
On the Containers page, browse the server to select the containers and click Next.
On the Summary page, verify the containers and servers, and then click Finish.
This adds the user context to the list. You can add multiple contexts at a time.