Niagara questions

Dear all

I am looking for tutorials or documentation for niagara, particulary:

  • how to key frame animate parameters (is it possible?)
  • how to set parameters externally with blueprints (I.e. spawncount)

thanks in advance

So I have hard time connecting the obvious dots - this short description is what I want to achieve. However I am missing something as I cannot seem to get a variable made and link it with a niagara value. So If anybody knows about a tutorial explaining this a bit more in details, please share.