How do I attach an actor to an actor?

Dear ,
I seem to have this problem to.
It is four years later but it still hasn’t been fixed, where did you post your issue again?
Just want to make sure it will get fixed in 4.20, except if it is not a bug.
Really weird, because I can attach my knife as preview, which basically is the same thing, isn’t it?

Edit:
I got it to attach it to a bone socket a year ago I think, now it works great.

https://9tdypw.am.files.1drv/y4mw9VKQ6q96qaK7D9FfyRW8qB3eyTjqRGZNhQUIzwXvUrzHMBZdQTXLC8XvqpUOYQUZG9a_JCZq_VmFUZxrcsTM5nzqTV8E3-RML1YdKjAd1XhNtru9B7EswjfTr3iHPIWNaviEram-SCWII7PbpObAX4jl6DDpEMeV5-heoLu4RftZVSv700sRI3moA3sPmI8GaLYa9SbhEUWo1Zt2eqtPw?width=3840
Edit: Don’t mind the gameplay errors it will give touching BSP, I’m sure U can solve them yourself^^!