It was just pointed out to me, in a private e-mail, that you can also upload directly from your computer via the WebUI and WiFi. Here's my response:
"That is quite true. I don't always trust WiFi, so I transfer files via
USB. My mistrust of WiFi is quite probably a carry over from bad
experiences with it in its early days. However, I've read about an
awful lot of problems with the B2 that are related to flakey WiFi. But
when the WiFi signal is good, I'm sure the method you describe will work
well."