I experience synchronisation problems in LR with mobile. Firstly that it is not reliable (LR on the desktop does not show it is still synchronising when logging out) i.e. synchronisation may or may not happen and manual synchronisation does not really help on that point.
Secondly there is a timer error; see attached showing that a picture is not synchronised yet, and is stated as added in future (compare date in Right corner below with that on the missing picture). I actually added the picture on 8-6 22:00 Dutch time (GMT+1)