What is it?
Blender is lack of native FBX support, when we import some older and newer FBX files, it often fails.

So I made a better FBX importer and exporter with official FBX SDK from scratch.

The add-on is compatible with all FBX versions, from ASCII to binary, from FBX 5.3 to FBX 2020.

I have tested the importer and exporter with about one hundred commercial FBX files which made by 3d digital artists in 3ds Max, Maya or Cinema 4D, the add-on can import and export these FBX files successfully.

The exported FBX and DAE files have been verified in Unity Engine 2021, Unreal Engine 4/5 and Godot Engine v4.1.1 with no issues.

Check the link for more information.