How to use additive track in montage?

I’m using UE4.81 and some free animations of blue character , I don’t know why but in many of animations my character will be rotated 90 degree facing ground so I decided to solve problem using an additive track and it worked but montage animations do not follow the final animation (combination of original animation and additive track )
what can I do ? why I cant save bone manipulations that forces me to use additive track for every animation ? and why additive track does not works in montage ? :frowning: :frowning: :frowning:

Someone please help i have the same problem too

BUUUUUUUUUUUUUMP

bump :frowning: