Detail this asset from Unity Store: Original Link
This is a paid asset, but now you can download Networking and Serialization Tools (TNet 3) Free.
Networking and Serialization Tools (TNet 3) v3.3.2
Networking and Serialization Tools (TNet 3) v3.0.1
TNet 3 is an extension for the Unity Editor that adds easy-to-use networking, powerful serialization tools as well as various useful coding extensions for developers. You can use TNet 3 to add such features as:
* Multiplayer (no user limits)
* Server content delivery
* Save/Load functionality
* Modding support
TNet 3 comes in full C# source code form and has been battle-tested in Starlink and Windward — games released on Android, iOS and Steam.
Detailed tutorials can be found here or in video format here.