File image not updating when file amended

Is there a way I can get the file image to update when a file is amended. The field is restricted to image file types only. I have a submit button but I want the user to be able to amend multiple existing files and view the updated file they have selected before submitting the page.
The user needs to be restricted from deleting the record so I have removed the ability to add or delete a record. They can only amend the currently loaded files to choose a different one.
ImagePreview