The pre-requisite for connecting to the iPhone or iPod Touch in order to copy files to and from the device is that you are able to "see" the iPhone or iPod Touch on the network. First, open the Doc2 app, press the Settings button (the cog button at the far left of the toolbar) and make a note of the connection address which will appear under the File Sharing switch when you turn on file sharing. The connection address takes the following form:
Once you have the connection address then make a note of the ipaddress portion of the connection address. Then open a command window (CMD.EXE on a PC or the Terminal app on a MAC) and type the following:
ping {ip address} [followed by Enter]
where {ip address} should be replaced with the actual IP address that you noted. Do you get successful responses? If not, then your dekstop PC will be unable to connect to the device in order to transfer files over the local network. You can either try to resolve the problem, possibly by rebooting your router, or you may prefer to setup a cloud storage account and transfer files over the 3G network, rather than over the wifi network.