In Simbrief, when setting up the download directories, sometimes the MSFS FS2020 directory isn’t detected.
Use the blue icon to navigate to the FS path from where the flight plans will be loaded:
For MSFS, depending on how you obtained the sim, this will be something like:
Sim from Marketplace:
%localAppData%\Packages\Microsoft.FlightSimulator_8wekyb3d8bbwe\LocalState
Sim from Steam:
%appData%\Microsoft Flight Simulator
