A clunky process parts of which I had to repeat 4 times [the bit where you convert 5 free GB to 50] but in the end it took OK. The whole thing seems clunky and a feeble imitation of Dropbox but 50 free GB is worth hanging on to until they iron out the site. Might be useful for sending things to others if nothing else.
Here is an article from CNET News that explains the process.
Mark Ford 