Change URL of image type item

How can I change the URL parameter of an item with a type of “image”? For example, I have this item in my form:


I want to update the url parameter after the form is saved or loaded so that I can send the unique ID of the record loaded (or created on initial save) in the form to the processing PHP page. (I’m going to have that page rename uploaded files to match the unique ID to avoid overwriting an image associated with another record.)


unfortunately there is no such functionality. but your form has an itemValue attr which is assotiated with your image and can be uniq for each image. here is a doc how it works