<form id="upload-form" enctype="multipart/form-data" method="post" action="upload.php?output=html">
    <button id="upload-btn" class="btn" type="button">Drop or paste file(s)</button>
    <input type="file" id="upload-input" name="files[]" multiple data-max-size="<%= max_upload_size %>MiB">
    <input type="submit" value="Submit">
</form>
<ul id="upload-filelist"></ul>