src/Database/Attach/Media.php
protected function hasFile($fileName = null)
    {
        $filePath = $this->getStoragePath().$fileName;
        return $this->getStorageDisk()->exists($filePath);
    }
protected function hasFile($fileName = null)
    {
        $filePath = $this->getStoragePath().$fileName;
        return $this->getStorageDisk()->exists($filePath);
    }
Check file exists on storage device.
@param string $fileName
@return bool