If the animations work fine and only fail after moving to a different folder, did you try to fixup redirections in folders?
Not sure, what is going on with your project exactly. Analyzing Lyra's Animation | Inside Unreal - YouTube - this one has an excellent explanation. Here, a categorization is done into basically 5 differenct cases, when to use which options basically. IK Retargeting is the last of the options if everything is different, like mesh hierarchy, ref pose, skeleton asset, extra/missing bones…