I prepared a FLPN in EFB/Simbrief, and then ??
No options to send to ATC and Avionics ?
What flight sim are you using, what aircraft/addon are you flying. And how have you tried to send it to ATC(what ATC, ingame, Vatsim/IVAO, BeyondATC, SayIntentions) and what avionics?
Your post is missing a few key details