In this Tutorial I walk through Creation of your own Animation by using Sequencer, then using it to create a Linked Animation.
We setup your AnimGraph to play Montages and blend Upper & Lower body together.
We Mirror the Animation so that 1 Animation Asset can be used for both sides of the character.
https://dev.epicgames.com/community/learning/tutorials/1VXr/unreal-engine-linked-animations-mirroring-montages-anim-graph