> ## Documentation Index
> Fetch the complete documentation index at: https://getoverlay.io/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Chat

> How to start, manage, and stop chats in Overlay.

## Start a chat

1. Open a project or your personal workspace.
2. Type your message in the input box.
3. Pick a model from the model selector.
4. Press `Enter` or click the send button.

## Ask and Act modes

* **Ask** — Overlay answers questions using memory, knowledge, and files.
* **Act** — Overlay can use tools such as browser, sandboxes, and integrations.

Switch modes from the toolbar next to the input.

## Attach files

Drag a file into the input or click the attachment icon. Files are stored in your knowledge and can be referenced in later messages.

## Stop and retry

* Click **Stop** at any time to stop the model mid-reply.
* Click **Retry** to regenerate a response.
* Hover over a message and click the menu to edit, delete, or copy.

## Generated UI

Some replies include cards, tables, or action buttons. These are generated from the model and can be run directly.

\[TODO: screenshot of chat UI with model selector and attachment icon]