Change your filepath in the iniManager to something shorter and then copy and paste the plane to your community folder. Known issue with iniManager that we are working on fixing
Ah, Navigraph doesn't have our flightplan format, which is weird, cause they have it on Simbrief. I guess you'll need to contact them to add our fpl format to the Navigraph website - or alternatively, just download the fpl file from simbrief
That sounds weird, it should work just fine.
Could you please try to delete your iniManager folders in AppData/Local and AppData/Roaming, then reinstall and see if the issue persists?