I added these files in the previous comment. Why there are not shown?
The bvh resources used in these captures are from this web site: https://accad.osu.edu/research/motion-lab/system-data.
When you import characters with animations by default there should be a t-pose in an attempt to create compatibility between programs. In 3DXcange there is an animation list, with each BVH file based on one animation movement there is likely only two animations.. you must delete the first one then apply it to iClone. Send your saved imotions back to 3DXchange and delete the first animation then apply it to iClone. This is something I had to do before and I don't see any mention that you're removing the t-pose in 3DXchange before applying it to iClone.
Hi sombat.khruathong, Please capture a screen video about this issue, put it on the YouTube, and add the link in your next comment. Your help is highly appreciated. Molly Reallusion