ChatFile

Represents the files that are part of the Message.

Name	Type	Default	Description
extension	string		File extension, e.g., '.pdf', '.jpg'.
id	string | number		Unique identifier for the file.
name	string		File name.
rawFile?	File		An in-memory representation of the file.
size	number		File size in bytes.
thumbnailUrl?	string		Optional preview image URL.
type	string		MIME type, e.g., 'application/pdf'
url?	string		Optional URL to download/view the file.