📘
This function is only available for composer plugins
This function is only available on context of type messageComposer

function downloadComposerAttachment(attachmentId: string, cancelToken?: CancelToken): Promise<Link>;

This method will download the attachment specified for the composer's draft.

Parameters

Parameter	Type	Description
`attachmentId`	String	The id of the attachment to be downloaded
`cancelToken`	CancelToken (optional)	Token to cancel the request

Return value

The function returns a Promise that resolves with either a File containing the attachment data or undefined if it failed to fetch the attachment data.