Did a few things

Assets/UserReporting/Scripts/Plugin/Version2018_3/Screenshots/ScreenshotManager.cs

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+using System;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace Unity.Screenshots
+{
+    public class ScreenshotManager
+    {
+        #region Nested Types
+
+        private class ScreenshotOperation
+        {
+            #region Properties
+
+            public Action<int, byte[]> Callback { get; set; }
+
+            public byte[] Data { get; set; }
+
+            public int FrameNumber { get; set; }
+
+            public bool IsAwaiting { get; set; }
+
+            public bool IsComplete { get; set; }
+
+            public bool IsInUse { get; set; }
+
+            public int MaximumHeight { get; set; }
+
+            public int MaximumWidth { get; set; }
+
+            public object Source { get; set; }
+
+            #endregion
+
+            #region Methods
+
+            public void Use()
+            {
+                this.Callback = null;
+                this.Data = null;
+                this.FrameNumber = 0;
+                this.IsAwaiting = true;
+                this.IsComplete = false;
+                this.IsInUse = true;
+                this.MaximumHeight = 0;
+                this.MaximumWidth = 0;
+                this.Source = null;
+            }
+
+            #endregion
+        }
+
+        #endregion
+
+        #region Constructors
+
+        public ScreenshotManager()
+        {
+            this.screenshotRecorder = new ScreenshotRecorder();
+            this.screenshotCallbackDelegate = this.ScreenshotCallback;
+            this.screenshotOperations = new List<ScreenshotOperation>();
+        }
+
+        #endregion
+
+        #region Fields
+
+        private Action<byte[], object> screenshotCallbackDelegate;
+
+        private List<ScreenshotOperation> screenshotOperations;
+
+        private ScreenshotRecorder screenshotRecorder;
+
+        #endregion
+
+        #region Methods
+
+        private ScreenshotOperation GetScreenshotOperation()
+        {
+            foreach (ScreenshotOperation screenshotOperation in this.screenshotOperations)
+            {
+                if (!screenshotOperation.IsInUse)
+                {
+                    screenshotOperation.Use();
+                    return screenshotOperation;
+                }
+            }
+            ScreenshotOperation newScreenshotOperation = new ScreenshotOperation();
+            newScreenshotOperation.Use();
+            this.screenshotOperations.Add(newScreenshotOperation);
+            return newScreenshotOperation;
+        }
+
+        public void OnEndOfFrame()
+        {
+            foreach (ScreenshotOperation screenshotOperation in this.screenshotOperations)
+            {
+                if (screenshotOperation.IsInUse)
+                {
+                    if (screenshotOperation.IsAwaiting)
+                    {
+                        screenshotOperation.IsAwaiting = false;
+                        if (screenshotOperation.Source == null)
+                        {
+                            this.screenshotRecorder.Screenshot(screenshotOperation.MaximumWidth, screenshotOperation.MaximumHeight, ScreenshotType.Png, this.screenshotCallbackDelegate, screenshotOperation);
+                        }
+                        else if (screenshotOperation.Source is Camera)
+                        {
+                            this.screenshotRecorder.Screenshot(screenshotOperation.Source as Camera, screenshotOperation.MaximumWidth, screenshotOperation.MaximumHeight, ScreenshotType.Png, this.screenshotCallbackDelegate, screenshotOperation);
+                        }
+                        else if (screenshotOperation.Source is RenderTexture)
+                        {
+                            this.screenshotRecorder.Screenshot(screenshotOperation.Source as RenderTexture, screenshotOperation.MaximumWidth, screenshotOperation.MaximumHeight, ScreenshotType.Png, this.screenshotCallbackDelegate, screenshotOperation);
+                        }
+                        else if (screenshotOperation.Source is Texture2D)
+                        {
+                            this.screenshotRecorder.Screenshot(screenshotOperation.Source as Texture2D, screenshotOperation.MaximumWidth, screenshotOperation.MaximumHeight, ScreenshotType.Png, this.screenshotCallbackDelegate, screenshotOperation);
+                        }
+                        else
+                        {
+                            this.ScreenshotCallback(null, screenshotOperation);
+                        }
+                    }
+                    else if (screenshotOperation.IsComplete)
+                    {
+                        screenshotOperation.IsInUse = false;
+                        try
+                        {
+                            if (screenshotOperation != null && screenshotOperation.Callback != null)
+                            {
+                                screenshotOperation.Callback(screenshotOperation.FrameNumber, screenshotOperation.Data);
+                            }
+                        }
+                        catch
+                        {
+                            // Do Nothing
+                        }
+                    }
+                }
+            }
+        }
+
+        private void ScreenshotCallback(byte[] data, object state)
+        {
+            ScreenshotOperation screenshotOperation = state as ScreenshotOperation;
+            if (screenshotOperation != null)
+            {
+                screenshotOperation.Data = data;
+                screenshotOperation.IsComplete = true;
+            }
+        }
+
+        public void TakeScreenshot(object source, int frameNumber, int maximumWidth, int maximumHeight, Action<int, byte[]> callback)
+        {
+            ScreenshotOperation screenshotOperation = this.GetScreenshotOperation();
+            screenshotOperation.FrameNumber = frameNumber;
+            screenshotOperation.MaximumWidth = maximumWidth;
+            screenshotOperation.MaximumHeight = maximumHeight;
+            screenshotOperation.Source = source;
+            screenshotOperation.Callback = callback;
+        }
+
+        #endregion
+    }
+}