file-upload.html

## file-upload.html
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <link href="https://cdn.jsdelivr.net/npm/tailwindcss/dist/tailwind.min.css" rel="stylesheet">
</head>
<body>
    <div class="h-64 border-solid border-black border-4 text-center" id="dropzone">
        Drop files here
    </div>

    <form action="test.php" enctype="multipart/form-data" method="post">
        <input type="file" name="files[]" id="files" multiple>
        <button type="submit">Send</button>
    </form>

    <script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>
    <script>
        var $dropzone = $('#dropzone');
        $dropzone.on('drag dragstart dragend dragover dragenter dragleave drop', function (event) {
            event.preventDefault();
            event.stopPropagation();
        }).on('drop', function(event) {
            document.querySelector('#files').files = event.originalEvent.dataTransfer.files;
        });
    </script>
</body>
</html>