I’ll take a look at your particle system just to verify what you are saying. First you need to fix a few things with your upload.
What you need to do is select the particle system and migrate it to a blank project so that the material and all the required assets that are associated with it are brought along.
Then at the top left of screen click on File > Package project > Zip Up Project
I’ve attached screenshots to help find these options. When done attach that ZIP directly in your next comment. Unfortunately the .COPY files you sent weren’t usable for testing purposes.
I apologize for the frustration but typically if we determine an issue to be content related and not an issue with the core functionality of the engine then we must move on due to time constraints. I may have been premature in my assessment which is why I am continuing this investigation.