Does the “Migrate” functionality not work for your case?
From what I understand, you tried to Export the Jump_Loop anim and import it to another project? When you export an animation, the mesh is not included with it. You’d need to import the Mannequin mesh before trying to import the animation. That is unless you have an existing with the same joint heirarchy.
We have not heard back from you in a few days, so we are marking this post as Resolved for tracking purposes. If you are still experiencing the issue you reported, please respond to this message with additional information and we will follow up.