Thanks support. I now have this working.
The mistake I was making was that I was putting the MyObject.Picture inside a HTML img attribute. I didn't realise that aware would parse the object into a HTML img tag! However, I couldn't get it to work using <<MyObject.PictureAttr>> this just seem to display the attribute name rather than the image. But <<MyObject.PictureAttr>> does work.
The other problem I had was trying to scale the picture - the image loads full size (couldn't get the containing div or span to affect the scale, but I am a HTML and CSS novice) The work around for this was to create another attribute MyObject.PictureAttrSmall and then used the SCALE_IMAGE function to populate this attribute from the original. This also works great.
Next problem is that the image is displayed sideways but I think this is a bug in mobile picture upload so have posted a problem report.
https://forum.awareim.com/viewtopic.php?p=28959#28959
Thanks