I’m still not sure when your getting the image or what you’re doing with it. I didn’t see anything about submitting the post so I am assuming that you want to get the image url and add that image to the text field. PHP will only do part of this. You’ll need to do an AJAX request, that request will call a function that is run in PHP to get the URL and return it. Since ACF is going to display that image this AJAX request is already done by ACF, but I don’t know enough about how this works in ACF to tell you how to get that value. It would probably take me several hours of trial and error to figure that out.
