Loading docs to DPT-S1 without physical connection

Any ideas on loading documents onto the device without physically connecting to my desktop computer with a USB cable?

I have seen discussions about the Sharefile service but it looks like most people cannot get this to work plus it costs $$

Has anyone been able to connect the DPT to a free service like dropbox?

I have also seen discussions about using network drives. This seems to be a way to go. I have an old one that I have not used in years but I would be willing to fire it up if it seemed promising. If you have made this work, I would be interested in your experience doing it.

Any other possible ways to do this?