Used persona to key new additive layer track and the newly keyed track does not show up in blendspace

This problem was plaguing me as well. After hitting “apply” in Persona it worked correctly for me. If “apply” is grayed out just re-key part of the animation and it will light up. Hope this helps.

I also encountered this problem and it nearly took me 2 days to figure it out.

In my case I needed to set the “retargeting options” to animation instead of .
This broke some of my animations but now i can change them in Persona and it works with blend spaces.

Retargeting options can be found as described here: Using Retargeted Animations in Unreal Engine | Unreal Engine 5.1 Documentation

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I encounter this bug in 4.16, and this solution works for me!

Thanks!