I somehow managed to find a bug where it unlocks the “Load Flight Plan”, and the two buttons on the bottom. However, I couldn’t replicate it just once.
(I pressed “Tab” in free flight planner, press the load button, then pop it in new window, go into the career select a mission after it loaded, select the plan that made for the mission, finally press the “File plan with ATC” and that should be it)
I made the plan with the web flight planner.
I’m tired of using bugs to play the game the correct way…