I’m still not sure what’s your exact problem.
The only thing i see so far is that your hierarchie isn’t the usual fbx setup.
Usually you have a null object that contains the skeleton and the mesh.
For example:
If your model turns out to be imported correct anyway, i guess your issue lies elsewhere.
Not sure which tutorial(s) you followed, but with the information currently given by you,
the issue can be anything from bugs in coding/blueprint to lack of animations and correct animation setup.