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Help me Unreal engine Animation Mesh

Hello !
i have just studied about unreal engine and niagara systerm , but i have a problem about animation mesh ? please help me!

01/ how can i attach multi animation meshs together with different skeletal mesh . i have 3 meshes with animation which is created by blender ( fbx) , how can i add and edit this meshes ( with animation ) simultaneously , can i do it with niagara system?.
02/VFX Reel By He Sir 2020特效作品 - YouTube
at time 01:09 , there are two dragons animation meshes attach with effect as niagara , please help me how can i do like that ?

Thank you very much