fixes U4-10816 Umbraco V7.7.1 - Media - File upload taking full path

src/Umbraco.Web/Editors/MediaController.cs

@@ -466,6 +466,17 @@ namespace Umbraco.Web.Editors
             [ModelBinder(typeof(MediaItemBinder))]
                 MediaItemSave contentItem)
         {
+            //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