Please do not attempt to use FTP across the WWW. It is notoriously insecure and sends username/passwords in plaintext and unencrypted. But you are in luck, Filezilla supports SFTP which tunnels through an SSH (secure and encrypted) connection. I would STRONGLY suggest changing your SSH port to a non standard port and change the default password for the osmc user before portforwarding though.
it is not too easy if you a really a total noob to Linux and networking
As a starting point you would need to be able to SSH into your OSMC box:
a. Assuming that you are having a windows machine you can install putty http://www.chiark.greenend.org.uk/~sgtatham/putty/ as a ssh client.
b. Establish a connect to osmc using user/password osmc/osmc.
When you are successful with that we can start walking you thru the next steps which are a bit more complex.
I’m able to SSH into my OSMC box. I followed a tutorial on Youtube last night, even managed to change the default password from “osmc” to something a bit more secure as was suggested on another part of the forum.
Try transfer locally files using sftp as ActionA indicated in his link http://bit.ly/1QZc9xK when successful with that we go the next step
Now we have to open up your OSMC towards the internet. First you really should be sure that you want to do that because there always remains a small risk when doing that. So to do that you would have to give a few more information how you are connected to the internet (e.g. which router you use,…). Basically what you need to do is establish a portforwarding on your router to your best by using externally a different port than 22. We can help you if we know you router details.
I am able to transfer files locally on my home network between my laptop and my Pi using Filezilla.
When you say that there is a risk in opening up my OSMC to the internet, what risks do you mean exactly?
To clarify, I bought a Raspberry Pi 2 recently and I put OSMC on it to use it solely as a media player. I have a dedicated hard drive attached to it that contains only my movies and TV shows. I don’t use the Pi for anything else. If it was hacked in some way all they would see was a hard drive with some films on right? Or am I being massively naïve? (The latter option is extremely possible BTW)
I can give you the exact make and model of my router a little later on when I’m home, but basically I’m with Sky TV and it’s the stock Sagem router that looks like this: