International check-in at Sydney domestic lounge?

[SBD]

Hi all,

I should have clarified this well before now and I’m flying in <8 hours: can I check into an international flight from the Sydney T2 lounge?

I’m on a VA reward itinerary, VA800 SYD-MEL connecting to UA99 to LAX.

Carry-on luggage only.

The United app won’t let me upload my travel documents in the normal way, saying instead that VA check-in staff will check them in Sydney.

Can that happen in the Sydney lounge, with an easier security line?

Thank you,

SBD