Ok, I think I understand what you are trying to achieve. Here's what you can do to copy the animation of the skeleton onto the meshed model:
1) Right-click the parent Null of the skeleton ("pearl_walk") and "Convert To" a "Model". A Model node is similar to a Null, but has additional information for managing animation clips on its children.
2) Right click the "pearl_walk" Model and select "Animation-->Create Clip". This creates a new "Clip" node under the Model which represents the animation of all parts of the skeleton.
3) Convert the parent Null of the meshed model ("Pearl") to a "Model" node as you did with "pearl_walk".
4) Right-click and clone the Clip node you created in step 2.
5) Drag and drop the cloned clip and parent it to the "Pearl" Model node.
6) Right click the cloned clip and select Animation-->Apply Clip. This applies the animation clip it contains to its parent Model, which is now the "Pearl" node. Since the skeleton has the same hierarchical structure and naming as where it was cloned from (the "pearl_walk" hierarchy), it will know how to copy the animation onto the new skeleton.
Note that with our v2 player, there is an issue with Clips where the identity of the animated nodes can cause confusion if you leave the original animation skeleton in the scene, so you should delete that once you've copied the animation clip over to the meshed model.
Hope that helps. I've verified this works with your fbx files (pearl + pearl_walk), so let me know if you need any further assistance getting this working.
David, Clara.io Developer