I saw on YouTube the person who made the animation which I want but I do not know how to create it, tell me the link to it UE4 - Advanced Locomotion System V3 - Features - YouTube
You mean this link: Advanced Locomotion System V4 in Blueprints - UE Marketplace ?? It seems the guy who sells this did a lot to make it smooth and implemented IK, ragdol with save-pose and standup and network replication. I don’t own this but it sounds promising. So the easiest would be to buy and study it as how-to if you wanna get exactly that. If you don’t have a clue about all this and just wanna give it a try without invensting money yet I would recommend the tutorial of this guy: https://www.youtube.com/watch?v=3GgVUKcGvAY - It’s not that advanced… but if you wanna study the howto of the advanced locomotion system you should bring a bit of understanding what you do anyway.