Help with Skinned Mesh

Help and Feedback Art Design Support
#1

  1. What do you want to achieve? I want to import a viewmodel from Half-Life 2.

  2. What is the issue? The mesh is glitched, the animation plays but the bones is made bigger and the mesh stays the same size.
    https://gyazo.com/6912e95b481887aabc859afc36b99cfa - Inside of Blender.
    https://gyazo.com/681fd912f81dec2d19bc969600206e41 - Inside of Roblox Studio.
    https://gyazo.com/ecf939a8e13b37913e7e9afe11b74618 - No animation playing.

  3. What solutions have you tried so far? Couldn’t find any.

#2

What format did you export it to?