JSFiddle - React, Tailwind, and code Playground

HTML

<form enctype="multipart/form-data" class="createAlbumFileUpload">
    <input type="file" name="uploadFile[]" multiple="multiple"/>
</form>

JavaScript

$("body").on("change", function(){  
    var numFiles = $("input",this)[0].files.length;
    alert(numFiles);
});