Attach a supported file
Attach a supported file in Cortex Chat: practical steps, setting explanations, result checks and troubleshooting.
Chat supports one non-empty attachment at a time, up to 20 MB. Supported families include Office documents, images, PDF, text, Markdown, CSV, JSON and supported audio. A recognised extension and a useful analysis result are separate concerns.
Before you start
The active composer determines where text, mentions and attachments will be sent. A private assistant panel can sit beside a shared conversation, so check the heading as well as the visible text. Inspect the file or recording before sending it; a local preview is not a completed upload. Chat validates a single attachment and rejects empty, oversized or unsupported files. Receipt state describes the message transport, not the success of a task requested inside it. If the result is uncertain, inspect the existing conversation and any external destination before retrying. This is especially important when a message asks the assistant to send, book or create something.
Step-by-step
- Select Add attachment in the intended composer.
- Choose one supported file and inspect its preview, name and any validation message.
- Add a question explaining what to do with it and submit when the attachment is correct.
What the settings mean
| Control or state | Meaning |
|---|---|
| Composer | The current destination for text and pending media. |
| Preview | Content selected locally and still awaiting the send action. |
| Receipt | Sending, failed, sent, delivered or read information. |
| Task result | The separate artifact or external action requested in the message. |
Check the result
The correct file is attached once to the intended conversation.
If it does not work
If rejected, check size, file type and whether more than one file was selected. Renaming an unsupported file extension does not make its contents supported.
Continue with the right context
Return to the Cortex Chat guide index to choose another task. Keep the current account, assistant and conversation in view when following the next guide. To use the product, open Cortex Chat.
- Send a text message
- Write a multi-line message without sending early
- Mention a group member or Sidekick
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