Bootstrap Snippet Multiple upload image, Preview image and draggable element by sortable using HTML CSS jQuery

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<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<div class="container">
    <fieldset class="form-group">
        <a href="javascript:void(0)" onclick="$('#pro-image').click()">Upload Image</a>
        <input type="file" id="pro-image" name="pro-image" style="display: none;" class="form-control" multiple>
    </fieldset>
    <div class="preview-images-zone">
        <div class="preview-image preview-show-1">
            <div class="image-cancel" data-no="1">x</div>
            <div class="image-zone"><img id="pro-img-1" src="https://img.purch.com/w/660/aHR0cDovL3d3dy5saXZlc2NpZW5jZS5jb20vaW1hZ2VzL2kvMDAwLzA5Ny85NTkvb3JpZ2luYWwvc2h1dHRlcnN0b2NrXzYzOTcxNjY1LmpwZw=="></div>
            <div class="tools-edit-image"><a href="javascript:void(0)" data-no="1" class="btn btn-light btn-edit-image">edit</a></div>
        </div>
        <div class="preview-image preview-show-2">
            <div class="image-cancel" data-no="2">x</div>
            <div class="image-zone"><img id="pro-img-2" src="https://www.codeproject.com/KB/GDI-plus/ImageProcessing2/flip.jpg"></div>
            <div class="tools-edit-image"><a href="javascript:void(0)" data-no="2" class="btn btn-light btn-edit-image">edit</a></div>
        </div>
        <div class="preview-image preview-show-3">
            <div class="image-cancel" data-no="3">x</div>
            <div class="image-zone"><img id="pro-img-3" src="http://i.stack.imgur.com/WCveg.jpg"></div>
            <div class="tools-edit-image"><a href="javascript:void(0)" data-no="3" class="btn btn-light btn-edit-image">edit</a></div>
        </div>
    </div>
</div>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
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.preview-images-zone {
    width: 100%;
    border: 1px solid #ddd;
    min-height: 180px;
    /* display: flex; */
    padding: 5px 5px 0px 5px;
    position: relative;
    overflow:auto;
}
.preview-images-zone > .preview-image:first-child {
    height: 185px;
    width: 185px;
    position: relative;
    margin-right: 5px;
}
.preview-images-zone > .preview-image {
    height: 90px;
    width: 90px;
    position: relative;
    margin-right: 5px;
    float: left;
    margin-bottom: 5px;
}
.preview-images-zone > .preview-image > .image-zone {
    width: 100%;
    height: 100%;
}
.preview-images-zone > .preview-image > .image-zone > img {
    width: 100%;
    height: 100%;
}
.preview-images-zone > .preview-image > .tools-edit-image {
    position: absolute;
    z-index: 100;
    color: #fff;
    bottom: 0;
    width: 100%;
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$(document).ready(function() {
    document.getElementById('pro-image').addEventListener('change', readImage, false);
    
    $( ".preview-images-zone" ).sortable();
    
    $(document).on('click', '.image-cancel', function() {
        let no = $(this).data('no');
        $(".preview-image.preview-show-"+no).remove();
    });
});
var num = 4;
function readImage() {
    if (window.File && window.FileList && window.FileReader) {
        var files = event.target.files; //FileList object
        var output = $(".preview-images-zone");
        for (let i = 0; i < files.length; i++) {
            var file = files[i];
            if (!file.type.match('image')) continue;
            
            var picReader = new FileReader();
            
            picReader.addEventListener('load', function (event) {
                var picFile = event.target;
                var html =  '<div class="preview-image preview-show-' + num + '">' +
                            '<div class="image-cancel" data-no="' + num + '">x</div>' +
                            '<div class="image-zone"><img id="pro-img-' + num + '" src="' + picFile.result + '"></div>' +
                            '<div class="tools-edit-image"><a href="javascript:void(0)" data-no="' + num + '" class="btn btn-light btn-edit-image">edit</a></div>' +
                            '</div>';
                output.append(html);
                num = num + 1;
            });
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"Multiple upload image, Preview image and draggable element by sortable"
Bootstrap 4.1.1 Snippet by faytranevozter

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"Multiple upload image, Preview image and draggable element by sortable" Bootstrap 4.1.1 Snippet by faytranevozter

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Questions / Comments:

"Multiple upload image, Preview image and draggable element by sortable"
Bootstrap 4.1.1 Snippet by faytranevozter