Cycles - glare/bloom isn't working? Ok, Im very new to nodes with the actual render but Im trying to do what these people did, just get a basic glow around my emissive materials: unity animate object transform into another How do I get the Glare node to output transparent instead of Black background

Maybe Im not understanding something basic but here's my node setup:



And, both just in viewport when I hit Render and then when I actually render out an image, nothing is remotely glowing:



those image planes are emissive - they aren't glowing any more than before. Whats wrong herE?
Here I created an example Scene with your node Setup (without any glowing effects)


Here I just switched the positions at of the input the Alpha-over node and then it worked