Hey @kham131 how are you?
I’ve been checking if there is any fix for that and I found this post that could help you!
Basically, the first thing you should do is to check if it is a project issue or a particles issue. You can check that by creating an empty project that uses that exact same particle and check if it works when you package it.
If it doesn’t work, it menas the problem id with the particle, and in the same post you have some sugestions to solve the issue.
In addition, if your particles are not working at all, you can check the Bounding Box settings in your particle, as it can be too little and make your aprticles dissapear. To do that, go to the Emitter settings in your Niagara System, search for “Calculate Bounds Mode” and adjust it as needed.
You can see how to do it in this video.
I hope this helps! Let me know if it works!