I have looked for this particular problem in the forums with no success.
I installed the Network Edition of 5.0 a couple of weeks ago and am not experimenting with 'Briefcase' before rolling it out and supporting it in beta.
I can successfully upload items while on the LAN or using a VPN to LAN but not outside of the LAN. Is there a port that needs to be opened or forwarded? When I try to upload while on a standard Internet connection there is a pause and it appears to be transferring but nothing ever shows up. I can create folders using the same connection.