I have implemented image upload section(imageuploadbefore.jpg in the attached files) based on this article http://www.sitefinity.com/support/kb/sitefinity-3-x/how-to-associate-content-items-with-files.aspx
When I upload an image for the first time, Upload window appears(uploadimagewindow.jpg in attached files)
and no problem at all.
Then, [Provider]Guid value is stored in the textbox(imageuploadafter.jpg in the attached files).
When I click on the select button again, Preview window appears with the image and being able to change the image file(imagepreview.jpg in the attached files).
The problem happens when I refresh the page, or go to edit mode.
[Provider]Guid value is still there, but when I click on the select button, it shows Upload window rather than Preview window.
Is this a bug or am I missing something?