A forum post’s page shows replies, edits, reactions and polls as they happen, and a forum’s list and a gallery show somebody’s new post as it is made. A post you follow opens as its page. Its author or a moderator can edit its title, from the post or its card; the change is in the audit log.
Whoever starts a post follows it, so an answer reaches them. Cards mark new posts and say how many replies are new, and viewing the forum clears its badge. Up in a post’s empty reply box edits your last reply there. Threads come back in full after a reload: stickers, polls, voice messages and reply lines.
Moderators can delete a thread, after a confirmation. Pins show the whole message: pictures, stickers, polls, GIFs and link previews. A command, or a message with a file attached, is never scheduled — Send later says why.