MASV is something worth trying. You get a link on their website and send it to your crew, it's easy and works well for the most of time if the footage is not too large, but it demands VPN as well. If you have a FTP account, you can also try Filezilla. But according to our experience, it may work for 50% of time. You'd better try it with your crew before the shoot. It works in other places in the world doesn't mean it works in China. Acutally, the best solution for sending big files ( over 100 GB) from China is shipping a hard drive. It could take a week or so to arrive in the US or Europe. The cost of shipping as well as a hard drive could be around 150 USD. But believe me, you could save a lot of energy and time, instead of writing to your crew everyday to check all the other options work or don't work.