Thank you very much for providing the method, but the problem still exists. The export and import of the original skeleton position data of the animated character will change, which means the body will deform. I think even if the FBX function is upgraded, no one will touch this part of the data. However, such a big error occurred, and I even think someone deliberately modified it to create such a ridiculous bug，this is very infuriating. Now I can’t distinguish whether it is the bug that existed in version 5.5 itself or the bug that appeared after upgrading to version 5.6，because before upgrading to version 5.6, I have been working on creating scenes and did not start the animation part of the character，I think such a low-level error is unforgivable,