I cant loop my r6ik rig animation correctly in blender?!

i want to make it so my running animation loops but it isnt working!

i copy and paste the keyframes from the start to the end BUT IT DOESNT WORK!?

here is the video plz help

try adding a few empty frames at the end, and also adding easing effects

Actually I noticed you have the arm at a different height

It is higher at the end than start, so it snaps lower at the loop

how do i fix it? sorry i am a noob at blender animating

on the far right you see the z pos value
go to the start, and write down the z pos
then
go to the end and change the z pos to exactly what you wrote down

and also make sure to have the arm selected