The file identifier of the file. A file identifier represents a file created or referenced earlier in the workflow (for example, from a file action or another step that produces a file). See Using with Files in Workflows for more details.
File Name
The name of the attachment, including the file extension.
Message Content
Plain-text body of the message. The first link to an image, video, or web page generates a preview chip.
Send To
Choose the message’s destination.
Space
The resource name of the space. Format: spaces/.
Thread Name
The name of the thread to reply to. If the message is sent, provide another message’s thread name to make this message a reply. Format: spaces//threads/.