In this short tutorial learn how to set up a playtest private map for UEFN and Fortnite Creative.
Allowing up to 50 playtesters to use your invite link and get early access to your creation!
Play testing helps sort out bugs, kinks, hardness, game play mechanics, match making and much more! Iteration and experimentation are a crucial part of keeping the experience functional, fun, & fresh! Don’t be afraid to apply feedback from users, or take it with a grain of salt 
https://dev.epicgames.com/community/learning/tutorials/R5L7/easily-create-your-own-playtest-groups-in-fortnite-creative-uefn