How do you do a glow overlay?

YouTube - Logan and Veronica - The Heartbreakingly Epic Story

the effects happen at :12 onwards.

I know how to overlay, but Idk how they get that solid white color border to be "feathered". Is that from blurring or something?

The white in thepic is just lots of 'glow' - the border I would do by adding whit boaders with the media gen and then add glow. That should work.

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