How can I modify an animation (not the skeleton) inside Unreal?

I’m a bit confused. I modified a couple of animations by modifying the rotation of some bones and a socket. Added Keys whenever I made an adjustment/modification. Then after I was done with modifications for this animation sequence I hit Apply and in the end finally Hit Record and played the animation to save the animation as a different file. Then I trimmed the saved file appropriately (remove dead frames etc).

Afterwards I went to modify/adjust another animation (of the same Character/Skeleton), but this time I Added keys and finally hit Apply as before but in the end I didn’t Record, I instead hit ‘Save’; this seemed much easier. However I then saw other animations and they were all changed/offset. So I assume that hitting Save changed the Skeleton and not the individual animation sequence!!

I spent a lot of hours for nothing and in the end came destruction. JUST HOW do I modify (just small adjustments) an animation sequence inside the engine (not having to go to Max or sth). Is it possible?

You just need to rotate the desired bone for the desired rotation, after you do this, click on Key and Apply immediately.
Do not change a lot of bones and do a lot of keys, UE4 isn’t an Animation Software, so use it just for really small adjustments.

As soon as you click on Key and Apply, you will notice that an Additive Layer Track will be created with the info you recorded.

I have the same issue. I want to edit a single animation, but it changes the position of the skeleton part for all other animations too. Does UE5 not support this feature?