Learn how to detect collisions in UEFN, using control rig.
This video covers radial (proximity) collisions, linear (ray-casting) collisions, and control rig blueprints for UEFN.
https://dev.epicgames.com/community/learning/tutorials/mzwL/fortnite-ray-casting-proximity-and-linear-collision-detections-for-uefn-verse