librilladora/app/Http/Controllers/FileUploadController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Http\Response;

class FileUploadController extends Controller {


    public function fileUploadPost(Request $request)
    {
        $request->validate([
            'archivo' => 'required|mimes:pdf|max:2048',
            'bookletsize' => 'min:1'
        ]);

        $fileName = time().'.'.$request->archivo->extension();
        $request->archivo->move(public_path('uploads'), $fileName);

        return redirect()->route("process", ['fileName' => $fileName, 'size' => $request->bookletsize]);
    }
}