Somnium Space SDK provides the ability to upload Avatar, Builder Item and World from Unity

Configure Somnium Space Unity SDK

The steps to install and configure Somnium Space Unity SDK.
* BUG: This tutorial use a pre-made Unity project since you cant create a Unity-2019.2.XX project with unity hub 3.0 + (you could use an older unity HUB version to, but it’s hard to find)

1. Create a Unity account
   • Unity Register Page
2. Install Unity HUB
   • Unity Hub Download Page
3. Install unity 2019.2.21
   • Unity 2019.2.21
4. Activate free license with Unity HUB
   • In Unity Hub: User / Manage License / Activate License
5. Use SomniumSpace-Guide project template (zip file).
   (Use Solution 1 or 2 to avoid any error)
   • Solution 1: Put the zip at the root of the C:/ drive before un-zip (then move the extracted folder at desired location).
   • Solution 2: Use 7-zip software to extract the project.
   • SomniumSpace-Guide Project Template
6. With Unity HUB, use OPEN and look for the project folder you just extracted.
7. Open the project.
8. Never Update Unity, keep version 2019.2.21
9. Somnium SDK may need an update before been usable.

Alternative links:

Somnium Space Official SDK:
Somnium Space SDK

Install Unity and SDK tutorial (Outdated)