Loop Animation
1. Bi-Blending the motion clips in Timeline is the fastest way to achieve this. Here is the tutorial and manual page:
https://courses.reallusion.com/home/iclone/character-motions?v=iclone-8-tutorials-bi-directional-blending-basic-motion-editing-3
How to create transitions between clips
https://manual.reallusion.com/iClone-8/Content/ENU/8.0/51-Animation-Timeline-Editing/Creating-Transition-between-Clips.htm
2. Reversing Clips
https://manual.reallusion.com/iClone-8/Content/ENU/8.0/51-Animation-Timeline-Editing/Reversing_Clips.htm
3. If there is a little bit difference to loop your animation Sampling motion clip, then copy the first keyframe and paste onto the last for completing the loop. And then flatten the motion clip back.
https://manual.reallusion.com/iClone-8/Content/ENU/8.0/51-Animation-Timeline-Editing/Clip_Sampling_Options.htm
For additional information, here are the related tutorials for looping animation.
Loop Motion
https://courses.reallusion.com/home/iclone/mocap-animation-training?v=loop-motion-|-mocap-animation-training-|-iclone-8
Loop Motion in Place
https://courses.reallusion.com/home/iclone/mocap-animation-training?v=loop-motion-in-place-|-mocap-animation-training-|-iclone-8
Loop Break Down
https://courses.reallusion.com/home/iclone/mocap-animation-training?v=loop-break-down-startloopend-|-mocap-animation-training-|-iclone-8
