Inserts an image from url and attaches the url to the image

image_input.gs

// Set Globals
var ui = DocumentApp.getUi();
/** Demonstrates a simple way to prompt the user for a date. */
function img_workflow() {
  // Set UI prompt + reminder to use unsecured image
  var url = ui.prompt('Enter URL of image', 'use http not https', ui.ButtonSet.OK_CANCEL);
  var line = url.getResponseText();
  // If user clicks OK
  if (url.getSelectedButton() == ui.Button.OK) {
    // fetch image url
    var response = UrlFetchApp.fetch(line);
    var binaryData = response.getContent();
    var blob = Utilities.newBlob(binaryData, 'image/png','myImage');
    // Get cursor position
    var doc = DocumentApp.getActiveDocument();
    var cursor = doc.getCursor();
    // Insert image
    var img = cursor.insertInlineImage(blob);
    // set URL of image
    img.setLinkUrl(line);
    // Exit
  } else if (url.getSelectedButton() == ui.Button.CANCEL) {
   Logger.log('The user canceled the dialog.');
  } else {
   Logger.log('The user closed the dialog.');
  }
}

/** Adds a menu to the Google Sheet. */
function onOpen() {
  var ui = DocumentApp.getUi();
  ui.createMenu('Custom Menu')
      .addItem('Inset Image Workflow', 'img_workflow')
      .addToUi();
}