I am trying to have multiple images on one html page

Question

I am trying to have multiple images on one page where each image on click opens to a lightboxes gallery with around 6 additional images in each gallery.

I have tried adding a second modal changing the id name also and that did not help I am at a loss. I'm sure it is something simple and I'm just missing it.

function openModal() {
  document.getElementById("myModal").style.display = "block";
 
}

function closeModal() {
  document.getElementById("myModal").style.display = "none";

}

var slideIndex = 1;
showSlides(slideIndex);

function plusSlides(n) {
  showSlides(slideIndex += n);
}

function currentSlide(n) {
  showSlides(slideIndex = n);
}

function showSlides(n) {
  var i;
  var slides = document.getElementsByClassName("mySlides");
  var dots = document.getElementsByClassName("demo");
  var captionText = document.getElementById("caption");
  if (n > slides.length) {slideIndex = 1}
  if (n < 1) {slideIndex = slides.length}
  for (i = 0; i < slides.length; i++) {
      slides[i].style.display = "none";
  }
  for (i = 0; i < dots.length; i++) {
      dots[i].className = dots[i].className.replace(" active", "");
  }
  slides[slideIndex-1].style.display = "block";
  dots[slideIndex-1].className += " active";
  captionText.innerHTML = dots[slideIndex-1].alt;
}

body {
  font-family: Verdana, sans-serif;
  margin: 0 200px;
}

* {
  box-sizing: border-box;
}

.row > .column {
  padding: 8px 8px 8px 8px ;
}

.row:after {
  content: "";
  display: table;
  clear: both;
}

.column {
  float: left;
  width: 25%;
}

/* The Modal (background) */
.modal {
  display: none;
  position: fixed;
  z-index: 1;
  padding-top: 50px;
  padding-right: 80px;
  padding-left: 240px;
  left: 0;
  top: 0;
  width:100% ;
  height: 100%;
  overflow: auto;
  background-color: white;
}

/* Modal Content */
.modal-content {
  position: relative;
  background-color: #fefefe;
  margin: auto;
  padding: 2;
  width: 100%;
  max-width:800px;
}

/* The Close Button */
.close {
  color: Gainsboro ;
  position: absolute;
  top: 10px;
  right: 25px;
  font-size: 25px;
  font-weight: 100;
}

.close:hover,
.close:focus {
  color: DarkSlateGray ;
  text-decoration: none;
  cursor: pointer;
}

.mySlides {
  display: none;
}

.cursor {
  cursor: pointer;
}

/* Next & previous buttons */
.prev,
.next {
  cursor: pointer;
  position: absolute;
  top: 100%;
  width: auto;
  padding: 4px;
  margin-top: -15px;
  color: DarkSlateGray;
  font-weight: 100;
  font-size: 20px;
  transition: 0.6s ease;
  border-radius: 0 3px 3px 0;
  user-select: none;
  -webkit-user-select: none;
}

/* Position the "next button" to the right */
.next {
  right: 0;
  border-radius: 3px 0 0 3px;
}

/* On hover, add a black background color with a little bit see-through */
.prev:hover,
.next:hover {
  background-color: rgba(0, 0, 0, 0.2);
}

/* Number text (1/3 etc) */
.numbertext {
  color: DarkSlateGray;
  font-size: 10px;
  padding: 8px 12px;
  position: absolute;
  top: 0;
}

img {
  margin-bottom: -4px;
}

.caption-container {
  text-align: center;
  background-color: white;
  padding: 2px 16px;
  color: white;
}

.demo {
  opacity: 0.6;
}

.active,
.demo:hover {
  opacity: 1;
}

img.hover-shadow {
  transition: 0.3s;
}

.hover-shadow:hover {
  box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
}

<h2 style="text-align:center">News</h2>

<div class="row">
  <div class="column">
    <img src="img/news/lampoon/0-image.jpg" style="width:100%" onclick="openModal(myModal);currentSlide(1)" class="hover-shadow cursor">
  </div>
  
  <div class="row">
  <div class="column">
    <img src="img/news/autre/0-image.jpg" style="width:100%" onclick="openModal(myModal-autre);currentSlide(1)" class="hover-shadow cursor">
  </div>

 
  
<div id="myModal" class="modal">
  <span class="close cursor" onclick="closeModal(myModal)">&times;</span>
  <div class="modal-content">

    <div class="mySlides">
      <div class="numbertext">1 / 2</div>
      <img src="img/news/lampoon/01-image.jpg" style="width:100%">
    </div>

    <div class="mySlides">
      <div class="numbertext">01 / 2</div>
      <img src="img/news/lampoon/02-image.jpg" style="width:100%">
    </div>

    <a class="prev" onclick="plusSlides(-1)">&#10094;</a>
    <a class="next" onclick="plusSlides(1)">&#10095;</a>

    <div class="caption-container">
      <p id="caption"></p>
    </div>
    
    
    <div id="myModal-autre" class="modal">
    <span class="close cursor" onclick="closeModal(myModal-autre)">&times;</span>
    <div class="modal-content">

    <div class="mySlides">
      <div class="numbertext">1 / 2</div>
      <img src="img/news/autre/2-image.jpg" style="width:100%">
    </div>

    <div class="mySlides">
      <div class="numbertext">01 / 2</div>
      <img src="img/news/autre/02-image.jpg" style="width:100%">
    </div>


     <a class="prev" onclick="plusSlides(-1)">&#10094;</a>
    <a class="next" onclick="plusSlides(1)">&#10095;</a>

    <div class="caption-container">
      <p id="caption"></p>
    </div>
</div>