Enter sends. Shift+Enter adds a new line. On a phone, use Send; the keyboard Return key adds a new line. Attach a file or drop it anywhere to send it with your message. Files go directly to the chat service; unsupported formats return an error. Images are resized to at most 1,024 pixels on either side. Other files must be at most 5 MB; images may be up to 25 MB before resizing. Messages can contain up to 1,024 characters. Revision 2.0.
