archivo de validación laravel
$request->validate([
'file' => 'required|mimes:png,jpg,jpeg,csv,txt,xlx,xls,pdf|max:2048'
]);
Grumpy Goosander
$request->validate([
'file' => 'required|mimes:png,jpg,jpeg,csv,txt,xlx,xls,pdf|max:2048'
]);$request->validate([
'file' => 'required|mimes:png,jpg,csv,txt,xlx,xls,pdf|max:2048'
]);