Not working with single frame hbjson

[dechanezt]

Hello,
I have a problem with single frame hbjson files. I need to import a cloud point that I generate in houdini from a fix element in unreal. The problem is that I need a lot of points (1'000'000 - 500'000 points) and making a frame sequence is very heavy and useless because I need static particles.
So I found this tutorial by sidefx which does exactly what I need. But when I import my file with a single frame it simply doesn't display even at the first frame.
I'm a newbie student in ue5 so is it me doing something wrong?
I also saw that this post was about something similar. Is it related?
Anyway thanks if you have an answer it would help me a lot!