How show image in a bootsrap modal

How can I open a modal to view the image? Here is my code:

<div class="fluid-container">
<div class="container">
<h1 class="text-center mt-5 mb-5 h1-title">Our Gallery</h1>
<div class="row d-flex">
@if(count($files) > 0)
@php $id=0;@endphp

@foreach($files as $file)

    @php $id++;@endphp

    <div class="col-xl-4 col-sm-6 p-1"><img class="btn p-0 card-img3" src="{{$file->image}}"></div>


<button type="button" class="btn btn-primary" data-toggle="modal" data-target="#exampleModal">
  Launch demo modal
</button>

<!-- Modal -->
<div class="modal fade" id="exampleModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
  <div class="modal-dialog" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title" id="exampleModalLabel">Modal title</h5>
        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
          <span aria-hidden="true">&times;</span>
        </button>
      </div>
      <div class="modal-body">
        ...
      </div>
      <div class="modal-footer">
        <button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
        <button type="button" class="btn btn-primary">Save changes</button>
      </div>
    </div>
  </div>
</div>


    @endforeach
    @else
    @endif
</div>

</div>

</div>
</div>