Libre Office image control (form control) doesn't work when exported to pdf

I am trying to create a form wherein the user can paste his/her picture in a given location. For this, I have used the image control from form control option.
This works like a charm in when in odt format, when I click on the given location, I am asked to browse for a picture and when selected, the picture is displayed in the document exactly as required.
But when I export it to pdf it doesn’t work. All I get when opeing using Adobe Reader is ‘Copy Image’.
All other form fields work fine. Any suggestions?

I am using Windows7,Libre Office,Adobe Reader

Thanks in advance

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Can you upload a sample document?