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Assets/Scripts/WSMessages/UploadMessage.cs

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+using System;
+using Newtonsoft.Json.Linq;
+
+[Serializable]
+public class UploadMessage
+{
+    public string type = "upload";
+    public string kind;
+    public JObject data;
+    public long timestamp = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds();
+}