adding the fix for content controller - to support when uploads are done via content.

src/Umbraco.Web/Editors/ContentController.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Globalization;
+using System.IO;
 using System.Linq;
 using System.Net;
 using System.Net.Http;
@@ -543,6 +544,17 @@ namespace Umbraco.Web.Editors
 
         private ContentItemDisplay PostSaveInternal(ContentItemSave contentItem, Func<IContent, Attempt<OperationStatus>> saveMethod)
         {
+            //Recent versions of IE/Edge may send in the full clientside file path instead of just the file name.
+            //To ensure similar behavior across all browsers no matter what they do - we strip the FileName property of all
+            //uploaded files to being *only* the actual file name (as it should be).
+            if (contentItem.UploadedFiles != null && contentItem.UploadedFiles.Any())
+            {
+                foreach (var file in contentItem.UploadedFiles)
+                {
+                    file.FileName = Path.GetFileName(file.FileName);
+                }
+            }
+
             //If we've reached here it means:
             // * Our model has been bound
             // * and validated