Publish a task, and reply to a client
Nothing reaches the portal until you publish it. Here is how the wall works in both directions.
Publishing
A task is invisible to the client until you turn on Visible to client in the task drawer. Published tasks are marked on the board, so you can see at a glance what is on the other side of the wall.
Comments have two sides
A comment is internal by default. To answer the client, switch the comment to Visible to client as you post it. Their reply comes back as a comment on the same task and notifies your team.
Approvals
A client with Approve access can approve a task or reject it with a reason, and both produce a notification and a live board update on your side. When the task carries file versions, the approval is bound to the specific version they were looking at — a version uploaded afterwards asks for a new one.