Cant download file from storage

public function downloadDocument()
    {
        // setting variables

        if (! $storage->exists($recordID . '/compiled')) {
            $storage->makeDirectory($recordID . '/compiled');
        }

        // Build the command
        $command = [
          // ...
        ];

        // Execute the command using Symfony Process
        $process = new Process($command);
        $process->setTimeout(30);

        try {
            $process->mustRun();
        } catch (ProcessFailedException $exception) {
            throw new RuntimeException('compilation failed: ' . $exception->getMessage());
        }

        $pdfPath = $recordID . '/compiled/main.pdf';

        if (! $storage->exists($pdfPath)) {
            throw new RuntimeException('PDF file does not exist after compilation.');
        }

        return Storage::download($pdfPath);
    }