Storage, S3 or Local

````
            $invoice_pdf_id = 0;

            $filename = $invoice->invoice_pdf_filename;

            if ($bucket_type = env('INV_BUCKET_TYPE', 'local')) {
                
                if (Storage::disk($bucket_type)->exists($filename) ) {
                    $invoice_pdf_id = $invoice->id;
                } else {
                    $invoice_pdf_id = 0;
                }

            }
````