gistfile1.php

<?php

        $ext = pathinfo($entity->get($field)['name'], PATHINFO_EXTENSION);  
        
        if($entity->has('company')) {
            $newFileName = $entity->get($field)['name'];
        }
        else {
            $newFileName = Inflector::slug($entity->company) . ".$ext";
        }
        
        $entity->get($field)['name'] = $newFileName;
        
        $this->setFilename($newFileName);