<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css" rel="stylesheet">
<link href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-fileinput/4.4.7/css/fileinput.css" media="all" rel="stylesheet" type="text/css"/>
<link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css" media="all" rel="stylesheet" type="text/css"/>
<div class="container">
<div class="row">
<div class="col-lg-8 col-sm-12 col-11 main-section">
<h1 class="text-center text-danger">File Input Example</h1><br>
<form enctype="multipart/form-data">
<div class="form-group">
<div class="file-loading">
<input id="file-1" type="file" multiple class="file" data-overwrite-initial="false" data-min-file-count="2">
</div>
</div>
</form>
</div>
</div>
</div>
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-fileinput/4.4.7/js/fileinput.js" type="text/javascript"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-fileinput/4.4.7/themes/fa/theme.js" type="text/javascript"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.11.0/umd/popper.min.js" type="text/javascript"></script>