Use this walkthrough to start a one-to-one conversation, expand it into a group when appropriate, and manage the group without losing sight of who can read its history. The most important decision comes before you add anyone: confirm that every new participant should be able to see the conversation's retained messages and attachments.
Before You Start
You need to be signed in and able to find at least one eligible participant. Messages is not an unrestricted people directory. Search results are limited to people you are allowed to contact through your shared chat participation, and blocking rules can prevent a conversation from starting or expanding.
Decide whether you want a one-to-one conversation or a group. If the discussion may become a group, consider the material that could already exist between you and the first person:
Adding a participant can expose retained history. Starting a one-to-one conversation with someone normally reuses the existing conversation between you. Selecting several people in Start private conversation opens or reuses a one-to-one conversation with one selected person, then adds the others to it. Adding someone from an open conversation expands that same conversation. Neither path guarantees a separate, empty group.
If any existing one-to-one history might be sensitive, use the staged path in this guide: open the one-to-one conversation first, inspect its history, and only then use Add participant. Do not multi-select people until you are confident that any retained history is suitable for the whole intended group.
Open Or Start The One-To-One Conversation
At this checkpoint, stop if any existing content should remain one-to-one. There is no clean-group option in this flow that can safely bypass retained history.
Prepare The Conversation
Direct Messages organize messages into topics. A conversation commonly opens with a topic ready, but if the composer says Create a topic first. Then you can type messages, create one before continuing.
You do not need to send a message just to prove that the selected audience is correct. The participant stack is the more useful check before changing membership.
Add People Safely
The staged path gives you a chance to inspect the reused conversation before its audience grows.
After an addition, the displayed conversation title resets to Group DM. Add everyone who belongs first, then rename the group; adding another person later can reset the title again.
You can also select several eligible people in Start private conversation and choose Start chat. Use that faster path only when you already know that any reused one-to-one history and attachments are safe for every selected person. Multi-select is not a separate clean-group creation flow.
Verify the participant stack and retained conversation together before changing who can read the group.
Rename The Group
Use a name that describes the shared outcome rather than a temporary aside. This makes the conversation easier to recognize after newer activity changes its position in the list.
The group row menu exposes title and membership controls without requiring either action during capture.
Leave Or Restore Membership
Leaving removes the conversation from your available Messages list, but it does not delete the conversation or its history for the remaining participants.
If a remaining participant later uses Add participant to add you again, the same retained conversation becomes available to you again. Its earlier topics, messages, and attachments are not replaced with a fresh history, and the conversation records another participant-add notice. Treat leaving as a membership change, not a way to erase or restart a group.
If A Person Cannot Be Added
Participant search and membership changes must satisfy the same eligibility and blocking boundaries used when starting a conversation.
Blocking does not promise that earlier messages or attachments have been erased. For the broader privacy and access boundaries, see Direct Messages.
Confirm Success
The group is ready when the participant stack matches the intended audience, the retained history is appropriate for everyone shown, and the conversation has a useful topic and title. A participant-add notice should mark each audience change in the conversation.
From here, you can organize the Direct Message with favorites, mute, and read controls. When you are working from a space, a conversation may also offer Invite to space; that invitation still follows the space's normal access rules. If meetings are available, the group can start or join a meeting from the conversation without moving the discussion into a space activity.

