Issue with creating looped keyframes

I am trying to create a loop of some keyframes I made in the edit page, but for some reason, copying and pasting them in the curve/keyframe editor doesn't work when trying to do so.
I remember being able to do it maybe a few months ago when trying to do something similar, and it worked fine there.
Does anyone know why this has changed, or how to create looped keyframes some other way? I just dont want to manually apply keyframe changes to tens of keyframes if I can avoid it
I remember being able to do it maybe a few months ago when trying to do something similar, and it worked fine there.
Does anyone know why this has changed, or how to create looped keyframes some other way? I just dont want to manually apply keyframe changes to tens of keyframes if I can avoid it