Mesh already has skeleton but won't import with it

So, i have imported a model from Source Filmmaker to Unreal 4. (With permission from a friend who made the model.)

I managed to import the materials perfectly with no issues, but it for some reason has no bones. While, in Source Filmmaker it has bones. (The standard. arms, legs, head, neck, knee, tail, etc). But, when i brought it in i could not edit the mesh and it would not show any bones. Could someone help with this? Thank you!