When I create several folders with the same name but different number at the end, like chapter 1, chapter 2, chapter 3, ..., chapter 10, the order in BTSync (Android) is not correct. Modern operating systems show them correctly (just tried in OSX), but BTSync shows in the wrong order of: chapter 1, chapter 10, chapter 11, chapter 2, chapter 3 etc. You can of course rename the folders chapter 01, chapter 02, but this is so 90s..