In version 9.1.0, only the text message to send with the file attachment appears to be missing from the response.
for example
message.channel.sendFile('http://i.imgur.com/6CbxaPc.jpg', 'Kappa.jpg', 'testmessage');
returns the image and renames the file, but does not include testmessage in the response
Fixed in latest indev :smile:
Most helpful comment
Fixed in latest indev :smile: