public function getExternalId()
    {
        if ($this->file && $this->file->getCrc32()) {
            return $this->file->getName().' ('.$this->file->getCrc32().')';
        }

        return null;
    }
public function getExternalId()
    {
        if ($this->file && $this->file->getCrc32()) {
            return $this->file->getName().' ('.$this->file->getCrc32().')';
        }

        return null;
    }
public function getExternalId ( ) { if ( $ this -> file && $ this -> file -> getCrc32 ( ) ) { return $ this -> file -> getName ( ) . ' (' . $ this -> file -> getCrc32 ( ) . ')' ; } return null ; }
Since there is no external ID when sending files, we'll include the file name and CRC check at creation.

@return null|string
Since there is no external ID when sending files we ll include the file name and CRC check at creation .