JSFiddle - React, Tailwind, and code Playground

HTML

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

JavaScript

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