Comments

Pin comment threads on actors, graph nodes, and assets, then resolve or reply.

You need to be connected. If you are not, the editor says "Connect to the server to add comments."

A comment pinned on a Blueprint node, listed with the other threads in the room.

Pin one

Use the pin button at the top right, the Comment toolbar button in the level editor or an asset editor, or Ctrl+Alt+C. Then click:

in the viewport, to pin the comment to the object you clicked (it follows that object when it moves)
in a graph, to pin it to the node you clicked
an asset in the Content Browser, with a right-click, when Comments on Assets is on

Esc or a right-click cancels placement. In the dialog, Ctrl+Enter publishes.

Open comments are drawn in the author's color. Click one to open its thread. Hide the pins with Show Comments without deleting them.

The list

Window > Tools > Comments, or the comment-list button at the top right. The number on that button is the count of open comments.

Each thread can be replied to (Ctrl+Enter), Resolved, Reopened, or Gone to. Go opens the map or the graph and frames the comment. On a World Partition map, Load the Actor Cell loads the cell that contains the actor.

Share in chat posts a link to the thread.

Filters in the list, also saved in personal settings:

Filter	Effect
Show resolved	Include threads that are already resolved. Off by default.
This map	Only threads on the open map.
This graph	Only threads on the focused graph.
Mine	Only threads you started.

You can edit your own messages. Deleting a thread asks for confirmation. Only the author can edit a message or delete a thread, also after restarting the editor. The server refuses anyone else with "Only the author can edit this message." or "Only the author can delete this comment."

A notification appears when someone comments, replies, or mentions you.

A room holds up to 2,000 threads. One thread holds 500 messages. Messages written before plugin 1.3 can no longer be edited.