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Does anyone know how I can make the effects at the following times?

https://www.reddit.com/r/unrealengine/comments/oddt4i/does_anyone_know_how_i_can_make_the_effects_at/ Does anyone know how i can make the effects at the following times @07:14, 08:17, 10:32 bat swarm?
I need tutorials please I use 4.26