https://docs.unity3d.com/2017.3/Documentation/ScriptReference/Networking.DownloadHandler.GetProgress.html
Unity - Scripting API: Networking.DownloadHandler.GetProgress
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https://docs.unity3d.com/es/2019.1/ScriptReference/Networking.DownloadHandler.GetProgress.html
Networking.DownloadHandler-GetProgress - Unity Scripting API
Callback, invoked when UnityWebRequest.downloadProgress is accessed.
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