im a chinese but im not in the official "blockade"(cuz i live in hong kong),so i dunno if any following stuff is wrong,but in China we got some "apps" which change our VPN and allow us to access google,facebook etc(ofc those are not for everyone cuz most app stores don't have those)
another method is,yes,use baidu,QQ,or wechat to access to files,that is less effective tho