Windows 2003 Fax Server – Save to Network Share

I have a Windows 2003 server running the FAX service. It seems to work well, however I would like to save the incoming faxes to a network share on a NAS. I can save them ok to a local drive. When I select a network path it states that the folder does not exist (which it does) or the FAX service does not have access to it. I have mapped the drive with an account that does have access but the FAX service is using a differet account. When I check the FAX service is running under NT Authority/Network Services and I don’t see any way to give that account access to a Remote Share.

Thanks,
Craig