To copy a mesh from one skeleton and paste it to another in Spine, you can follow these steps:

1. Import the Skeleton: First, import the skeleton that contains the mesh you want to copy into the project where the target skeleton resides. This can be done using the "Import Project" feature.

2. Drag and Drop: Once both skeletons are in the same project, you can drag the mesh from the original skeleton to the target skeleton. Ensure that the images are the same size and in the same slot if you are using linked meshes.

3. Adjust Image Path: After moving the mesh, you may need to replace the old image path in the mesh with the new one to ensure it displays correctly.

4. Vertex Copy/Paste: If needed, you can copy and paste vertex positions between meshes, provided they have the same number of vertices. Ensure the order of selection matches the desired application order.

For more detailed guidance, you can refer to the Spine User Guide on Linked Meshes and Transform Copy.

suanLoBeach Your understanding is correct. You cannot directly copy a mesh from another skeleton. What you can do is move it to another skeleton.