So you need a few things for events to work.
- In the larger debris system, you need to put an event generator. Inside of that event generator, you’ll need to set the Type (to spawn, it sounds like you need)
- In the Event Generator, give the event a custom name (ex. SpawnSand)
- Add an eventReceiver Spawn module to your fine sand emitter.
- Be sure that you set the event generator type to spawn.
- Set the eventReceiver Spawn spawn count to some value
- Set the source event name to a custom name (ex. SpawnSand, needs to be the same as above)
That should do it!
Let me know if you need any more assistance.