[PROBLEM] Copying files to the SD card

[tttapa]

Hello

I'm new to XBian (stable release for Raspberry Pi 2), and i've been trying to get some media files on the sdcard (32GB, so there should be enough space). I read on this forum that it's not possible to mount the card on my Ubuntu pc. I tried resizing the partitions, and created a fat partition as well, where I put my music and movies, but XBian doesn't recognize it... I tried a usb pendrive, when I plugged it into the Pi, I could access the files on it in Kodi, but I couldn't find a 'copy' option. (An external hard disk didn't work for me, it doesn't spin up, even with a 5A power supply, is there a way to get this working without a powered usb hub?)
Then I tried copying everything over the network. Ubuntu sees a remote login and a media share, but the media share is not writable, so no luck either...

What is the best/easiest/fastest way to get my media files on the SD card? Or is this simply not possible?

Thanks in advance
Tttapa