When ever the particle source is out of camera or something block it, the particle stop working. I even try by enabling fix bound and increase it bound as well I disable all culling option.
fig : increase fix bound.
fig : when particle source is not in camera.
fig : when particle source is in camera.
never worked on unreal…have you gone through this?
https://docs.unrealengine.com/4.27/en-US/RenderingAndGraphics/VisibilityCulling/
maybe it might help
I have disable all the culling setting, may be its u5 feature sad