When I import FBX animation using UE5.3 version, it seems that the skeletal animation with (mirrored) suffix cannot be imported. However, UE5.2 and 5.1 versions can be imported successfully.
Greetings @yuzuodong666
Welcome to the Unreal Engine Community Forum. I’d be happy to look into the error. Can you provide me the full error that is showing up when you’re importing 5.3? Thanks!