1- It does happend with a basic mesh.
2, 3
-I opened a blank blueprint project with no starter content
-I made a blueprint class ‘Character’ and I added a camera in it’s blueprint
-I imported a flashlight fbx file and putted it in front of a camera and it was visible in game
4- Yes, I tried to look at it with another CameraActor and it was visible
5- Yes, it’s visible