Is this a particle system from the starter content?
IF so dragging it onto your level should start right up.
Is this another particle system?
hi guys. i;m new here!
i was doing tutorial called “Working with Components on Actors Part1”
i added TutorialParticle Sytem but i t didn;t work out
i expected fire but output was jsut a smoke with grey square textures
how to solve this problem?
P.s Sry for bad English
The gray square texture means that your material assigned to the particles was not found (or sometimes it means it isn’t compiled yet). Open Cascade (the FX editor), select the “required” module within your module stack, and within the details panel find the top option for “material.” Make sure there is a valid material assigned here, and if not, assign one by selecting it in the content browser and then pressing the arrow next to the material property box.
Sorry, I’d add a diagram but I’m not on a computer with Unreal installed at the moment.
Good luck!
thnks a LOT!
there was no fire texture 
i guess i accidenltly erased whatever
any way thnks!