The border between China and Nepal is complicating the search for some Australians missing after the catastrophic floods that hit the region.Family members desperate for answers are appealing for more information from Chinese authorities and more assistance from the Australian government.Nepal flash floods updates: Follow this story as it unfolds with our live blog.Many of the 43 Australians missing after the disaster were pilgrims trekking from Nepal into Tibet to visit Mount Kailash, a revered site in four different religions.Thousands of people visit the Himalayan peak each year, and multiple tour groups have reported people missing in the disaster.One group…