How to show the uploaded filename in the File field type using bootstrap 4
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In the Symfony bootstrap_4_layout.html.twig, if you upload a file the filename is not displayed in the field.
You need additional javascript for this:
$('.custom-file-input').on('change',function(){
var fileName = $(this).val().replace(/.*(\/|\\)/, '');
$(this).next('label').addClass("selected").html(fileName);
});