Modified Animation Not Being Used

I have modified an Animation Sequence by adding keyframes, and it looks perfect in the editor. I saved it and confirmed by closing and re-opening it and the changes are persistent. However, if I apply the animation to my character via animbp, or even directly to the mesh component of my character, it uses the original/unedited animation.

I’ve been reading docs and watching tutorials etc, and I don’t see any additional steps that need to be done after editing the animation, but obviously something isn’t right. It could possibly be something with the Synty Polygon assets, but I don’t know what to check.

Never found a solution to this. I had a couple of more knowledgeable people confirm that what I’m doing should work, but it just isn’t. It is UE5, but I don’t think anything relevant has changed. Maybe I should move the post to that area of the forum though?