Scanning sandboxed files

I've just discovered Sandboxie. I plan on downloading a few files sandboxed, then scanning with Norton Security Suite before recovering them. For some reason, when I right click the sandboxed file and select "Insight Network Scan", I get a popup saying Norton has cancelled the scan - "there are no items to scan". This doesn't happen with unsandboxed files. Is there a way to make Norton recognize and scan them, or is it not necessary since apparently Norton automatically scans files after downloading, regardless of it being in the sandbox?