Posted: 27/09/2017 at 14:14
At the top right hand corner of the message box you will find a camera icon. If you click on this it will take you to your browser where you can upload from your pictures.
This site seems to have a limit on the file size that can be uploaded. Under 2MB and it should load ok, as most modern phones and cameras produce bigger files, you will probably need to reduce the file size.
If it's the correct size then a progress bar will appear along the bottom of the message box, showing that the picture is uploading.
Hope that helps.