In most cases, 3D assets are created in external software such as Blender, Maya, 3ds Max, or ZBrush and then imported into Unity for use in a project. Unity supports various 3D model formats, ...

Onnx model import failed using Unity Barracuda Problem As mentioned here, the SSD mobile net support only since opset 10. However, here, Unity says to use opset 9 for wider coverage.

Open Unity (Unity 5 is free to download) Create a new project and scene Go to the Assets Menu and select Import new asset. Select the .FBX Model you had exported from Blender.