From what I understand, nothing is ever stored on popplug servers - data is only kept on your drive and nowhere else.

It sounds like your work's firewall is causing problems on - they might be blocking specific ports for uploading files.

Wayne McKinney said: I'm still wondering, though, why the progress bar comes up showing that it's uploading. The progress bar even shows varying upload speed from 3.8MBs to 4.1MBs. Regardless of that, do you know what specific ports are needed to upload? I assumed that, since this was a web interface, that the upload was done via port 80. Would that be correct or is some other port used?

The only thing I can find about ports is in this article about UPD: Here.  That article only mentions the desktop ap though.  I can find no mention of port 80 being used whatsoever but that doesn;t mean anything.  I cannot say for sure, but it is possible that some proxing is being done at a higher level

My guess is that the uploading that you think is happening isn't really happening - your office firewall isn't processing things.

I don't have any knowledge about what ports the web interface is using for uploading.