The UAnimationBlueprintLibrary API is expressed in terms of UAnimSequence which prevents its use for animation modifiers. Refactoring the API in terms of UAnimSequenceBase would allow anim modifiers to be used on montages as well.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-120734 in the post.
|Component||UE - Anim - Runtime|
|Created||Jul 27, 2020|
|Updated||Aug 30, 2022|