Can you describe the problem? What happens?
I encountered a Control Rig issue on Android build w/ 4.27, where if I didn’t utilize the Setup Event, and relied on the initial positions of the controls set via the Viewport, my rig would collapse.
The trick/hack (in 4.27), if you want to use control positions placed manually via the viewport, was to set the initial position of the controls in the Setup Event by Get Transform of the controls, then feeding this transform right back into the control via Set Transform.
Again, without knowing your symptoms… I’m just shooting in the dark here… but an excuse for me to share, as this thread is the only Control Rig / Android related issue post I’ve come across while looking for solutions to my own problem.