Hi,
I was a little too brief in my question.
What you described is what I tried initially, but with both my app and the FileUpload example app it doesn't display the image on uploading. The problem, from what I can tell, is that when the file is uploaded the string field that identifies the image file is initially set to the full pathname which can't be displayed because it is not safe. It is only when the field is validated before saving to disk that the path is truncated to just the uploads folder and so can be displayed. I just wanted to confirm there wasn't some in built feature that could do the truncating on upload before the display field is refreshed before trying to come up with a solution. I will post anything I come up with.