ChatFile

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Represents a file attachment in a Chat message.

Name	Type	Default	Description
id	string		Unique identifier for the file.
name	string		Name of the file.
size	number		Size of the file in bytes.
thumbnailUrl?	string		Optional preview image URL for the file.
type	string		MIME type of the file (for example, application/pdf).
url?	string		Optional URL to download or view the file.