I need to see the glowing orange balls flow during my BP operations but nothing happens, I try to pick a debug filter but only get this:
You need to hit play first. 
I didn’t notice it was the character. Honestly this is someone else’s screenshot I just used it because it was convenient. I’m having a problem with a projectile object that spawns from a weapon. I’m not sure how to select it after gameplay starts either.
You can add a breakpoint on one of your nodes,hit play and then your game will pause when the flow goes through that node and then you can select your projectile to debug.
use print string as a debug option so add them radomly thoughout the line name them 1,2,3,4 then if the line gets that far it will print it to the screen