My route is CMB to DXB to GRU to PTY all on a single ticket (Emirates, part of it codeshare through COPA).

When I land at GRU, it will be in Terminal 3 and there will be about an 8 hour layover and the departure flight to PTY is also in Terminal 3.

I've read that the COPA check in desk to get the boarding pass is behind immigration.

1) How do I go from arrivals to departures area in Terminal 3? (We don't want to go through immigration or "enter" brazil)
2) How do I get the boarding pass if COPA check in desk is behind immigration? I don't know if I can print it through a kiosk or even do mobile check in because the COPA website states mobile check in is not available for tickets sold through other airline carriers.