Update Images by URL

UpdateImage.gs

/**
 * Updates images by there URL. Run when image changes
 * This only works for images that have a link to themselves in a google doc
 * To link an image right mouse click and select link. Put a link to the image URL there
 * URLs for images in Drive take the form http://drive.google.com/uc?export=view&id=##IMAGE ID HERE##
 * Will replace image with same dimensions. Will not match rotation angle. 
 * I think the URLs need to be http rather than https to work consistently.
 */
function replace_images_url() {
 // Open the document by id
  var body = DocumentApp.openById(### DOC ID GOES HERE ###).getBody();
  // Locate the old image for updating
  //This is the section that needs work. Need to identify images in doc by their drive id
  var olds = body.getImages();
  // loop through image list
  for (const [i,v] of olds.entries()){
    // the old image
    var old = olds[i];
    var old_link = old.getLinkUrl()
    //get the new image
    var response = UrlFetchApp.fetch(old_link);
    var binaryData = response.getContent();
    //get blob
    var blob = Utilities.newBlob(binaryData, 'image/png','myImage');
    //get the location of the old image
    var parent = old.getParent(); 
    //insert new image in front of it
    var img = parent.insertInlineImage(parent.getChildIndex(old)+1, blob);
    //set width and higher of new image to that of the old image
    var w = old.getWidth();
    var h = old.getHeight();
    img.setWidth(w);
    img.setHeight(w * h / w);
    img.setLinkUrl(old_link);
    //delete the old image
    old.removeFromParent();
  }
  
}