Hi,
It isn’t possible to access the file system, so it isn’t possible to load plans from file. Best is to plan your flight in Charts Desktop or Cloud and then load that flight as PLN file in MSFS, and that flight will also be available in the in-game panel.
We are also working on a way to load the flight directly from MSFS.
See also Navdata Center 1.0.0.26 and Black Hole Event Horizon - #2 by stephen
Regards,
Stephen