> For a complete page index of the Captain API documentation, fetch https://docs.captain.dev/llms.txt?excludeSpec=true

# Email Uploads and Chat Citations in Studio

* **Upload emails from Studio**: the file picker and drag-and-drop now accept `.msg` and `.eml` files, and email is listed with the other supported formats. An uploaded email is indexed the same way as through the API: one document for the message and one per attachment, linked by `email_attachment` and `email_reply_to` relations. See [Supported File Types](/guides/supported-file-types#email).
* **Chat answers quote their sources**: an answer on Home backs its key facts with one to three quoted passages, each attributed to the file and page it came from (or the timestamp, for audio and video). This replaces the numbered markers and the source list that sat under the answer.