Updating a client’s Files

From your 'My Hub' page (please see below)

On the left hand side of your account, you will see the side menu where you can select 'Contacts'.

Click into the clients profile.

Head to 'Assignments' from the list below the client profile picture and click 'Files'

You will then be able to update any files assigned to that client by clicking the 'Assign Files' button at the bottom of the screen.