Blender Imported FBX Plane Not Deforming

It is different in wireframe mode. Here:

wow looks like they subdivided it a lot of times.
that seems to be the thing you missing.

So do I just go into edit mode subdivide the Plane Mesh?

I subdivided 10 times but it still stops deforming after 4 bones. If I export a plane with more than 10 4 bones then it deletes the bones. When I move the vertices in blender they do deform.

Then what you need to do is go to the animation editor and then choose show all bones.

In Roblox or Blender and how does that help the fact that it still stops deforming after 4 bones. Since it only has four vertices even though I subdivided.

maybe the creator used wieghts.

What are weights???

they tell the bones what parts of the mesh to control so maybe the problem is that you are using a script that can’t make weights so they use auto ones and what you need to do is select the mesh in blender then the bones then you can paint what areas are controlled by which bones.
Here’s a detailed tut on that