3D Model Thumbnail not Loading

Hello, couple of days ago I made a 3D model of a Lego Brick, and I tried to upload it into the community. But it always gets stuck at making the 3D thumbnail. I've added images of the 3D asset as said in the pop menu about the beta version. Does anyone know how to fix this issue.

Here is the Model:

Model Specifics:

Format: fbx & gbl

Software: Blender

Render Tool: Substance 3D Stager

Fardware Specifics:

Macbook 2017 intel icore i5

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