Form Uploaded Image not exist when Edit form

I have create form with some text field and one image field. It add successfully after submit.

but when i edit this form.. my form fields prefilled value exist of that particular id (to which i edit) . but form image not show existing image and request to enter new image. 

kindly let me know solution. as i want to my previous image already uploaded when i edit this form.. if i upload new then it replace. otherwise same image uploaded.

kindly revert asap. 

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