Cant sent picture attached to text from Gallery

[Dave H]

Hi, I am using the ubuntu MX4 with version 15.04 (r4) update. When I attached a picture using the galory app or file manager the text message fails to send (red text is shown "Failed"). I have tried pictures taken from the phone camera and other pictures but the same result. I called my provider Tesco and confirmed that I have picture messaging is enabled (it is). Can you please investigate.
Note, it would also be useful to attached documents etc.

General comment. I also find the default gray text very dim and difficult to read, once you navigate to the website (such as the BBC) the text is far better. This is not so good for a phone that's designed to be content based.
When the Ubuntu phone goes main stream in 2016 and the user wishes to add a background picture this will become a real problem.