JSFiddle - React, Tailwind, and code Playground

HTML

<input type="file" id="Upload"></input>
<img id="thumbnail" src="#"></img>

JavaScript

$(function () {
    $(document).on("change", "#Upload", function(e) {
        showThumbnail(this.files);
    });
    
    function showThumbnail(files) {
        if (files && files[0]) {
            var reader = new FileReader();
            
            reader.onload = function (e) {
                $('#thumbnail').attr('src', e.target.result);
            }
            
            reader.readAsDataURL(files[0]);
        }
    }
});