diff --git a/DNN Platform/DotNetNuke.Web/InternalServices/FileUploadController.cs b/DNN Platform/DotNetNuke.Web/InternalServices/FileUploadController.cs
index 0b412dddeb7..991441a9660 100644
--- a/DNN Platform/DotNetNuke.Web/InternalServices/FileUploadController.cs	
+++ b/DNN Platform/DotNetNuke.Web/InternalServices/FileUploadController.cs	
@@ -343,7 +343,7 @@ public Task<HttpResponseMessage> UploadFromLocal(int portalId)
                     foreach (var item in provider.Contents)
                     {
                         var name = item.Headers.ContentDisposition.Name;
-                        switch (name.ToUpper())
+                        switch (name.ToUpperInvariant())
                         {
                             case "\"FOLDER\"":
                                 folder = item.ReadAsStringAsync().Result ?? string.Empty;
diff --git a/DNN Platform/Tests/DotNetNuke.Tests.Utilities/Mocks/MockComponentProvider.cs b/DNN Platform/Tests/DotNetNuke.Tests.Utilities/Mocks/MockComponentProvider.cs
index 90372fc9d79..5e126821a42 100644
--- a/DNN Platform/Tests/DotNetNuke.Tests.Utilities/Mocks/MockComponentProvider.cs	
+++ b/DNN Platform/Tests/DotNetNuke.Tests.Utilities/Mocks/MockComponentProvider.cs	
@@ -102,6 +102,11 @@ public static Mock<RoleProvider> CreateRoleProvider()
         {
             return CreateNew<RoleProvider>();
         }
+
+        public static Mock<IPortalController> CreatePortalController()
+        {
+            return CreateNew<IPortalController>();
+        }
 
         public static void ResetContainer()
         {
diff --git a/DNN Platform/Tests/DotNetNuke.Tests.Web/DotNetNuke.Tests.Web.csproj b/DNN Platform/Tests/DotNetNuke.Tests.Web/DotNetNuke.Tests.Web.csproj
index d0ff99bcb02..6216eb99b9d 100644
--- a/DNN Platform/Tests/DotNetNuke.Tests.Web/DotNetNuke.Tests.Web.csproj	
+++ b/DNN Platform/Tests/DotNetNuke.Tests.Web/DotNetNuke.Tests.Web.csproj	
@@ -108,6 +108,7 @@
     <Compile Include="DependencyInjection\BuildUpExtensionsTests.cs" />
     <Compile Include="DependencyInjection\BuildUpExtensions_SampleFilters.cs" />
     <Compile Include="InternalServices\FakeModuleCrawlerController.cs" />
+    <Compile Include="InternalServices\FileUploadControllerTests.cs" />
     <Compile Include="InternalServices\SearchServiceControllerTests.cs">
       <SubType>Code</SubType>
     </Compile>
@@ -139,6 +140,10 @@
       <Project>{0FCA217A-5F9A-4F5B-A31B-86D64AE65198}</Project>
       <Name>DotNetNuke.DependencyInjection</Name>
     </ProjectReference>
+    <ProjectReference Include="..\..\DotNetNuke.Instrumentation\DotNetNuke.Instrumentation.csproj">
+      <Project>{3cd5f6b8-8360-4862-80b6-f402892db7dd}</Project>
+      <Name>DotNetNuke.Instrumentation</Name>
+    </ProjectReference>
     <ProjectReference Include="..\..\DotNetNuke.Log4net\DotNetNuke.Log4Net.csproj">
       <Project>{04f77171-0634-46e0-a95e-d7477c88712e}</Project>
       <Name>DotNetNuke.Log4Net</Name>
diff --git a/DNN Platform/Tests/DotNetNuke.Tests.Web/InternalServices/FileUploadControllerTests.cs b/DNN Platform/Tests/DotNetNuke.Tests.Web/InternalServices/FileUploadControllerTests.cs
new file mode 100644
index 00000000000..e3f5d8251ab
--- /dev/null
+++ b/DNN Platform/Tests/DotNetNuke.Tests.Web/InternalServices/FileUploadControllerTests.cs	
@@ -0,0 +1,125 @@
+namespace DotNetNuke.Tests.Web.InternalServices
+{
+    using System.Data;
+    using System.Linq;
+    using System.Net.Http;
+    using System.Threading;
+    using System.Threading.Tasks;
+    using Abstractions;
+    using Abstractions.Application;
+    using Abstractions.Logging;
+
+    using Common;
+    using Common.Lists;
+
+    using Data;
+    using DotNetNuke.Entities.Portals;
+    using DotNetNuke.Web.InternalServices;
+
+    using Microsoft.Extensions.DependencyInjection;
+
+    using Moq;
+
+    using NUnit.Framework;
+
+    using Services.Cache;
+
+    using Utilities.Mocks;
+    /// <summary>
+    /// Tests FileUploadController methods
+    /// </summary>
+    [TestFixture]
+    public class FileUploadControllerTests
+    {
+        private Mock<DataProvider> _mockDataProvider;
+        private FileUploadController _testInstance;
+        private Mock<CachingProvider> _mockCachingProvider;
+        private Mock<IPortalController> _mockPortalController;
+        private TestSynchronizationContext _synchronizationContext = new TestSynchronizationContext();
+
+        [SetUp]
+        public void SetUp()
+        {
+
+            this.SetupDataProvider();
+
+            this.SetupCachingProvider();
+
+            this.SetupPortalSettings();
+            this.SetupServiceProvider();
+            this.SetupSynchronizationContext();
+        }
+
+        [Test]
+        [SetCulture("tr-TR")]
+        public async Task UploadFromLocal_ShouldUploadFile_WithTrCultureAsync()
+        {
+            var formDataContent = new MultipartFormDataContent();
+            formDataContent.Add(new StringContent("Hello World!"), "\"postfile\"", "\"testing\"");
+
+            var request = new HttpRequestMessage();
+            request.Content = formDataContent;
+            this._testInstance.Request = request;
+            await this._testInstance.UploadFromLocal(-1);
+
+            Assert.IsTrue(_synchronizationContext.IsUploadFileCalled());
+        }
+
+        private void SetupPortalSettings()
+        {
+            _mockPortalController = MockComponentProvider.CreatePortalController();
+            _mockPortalController.Setup(x => x.GetCurrentPortalSettings()).Returns(new PortalSettings() { PortalId = 0 });
+            PortalController.SetTestableInstance(_mockPortalController.Object);
+        }
+
+        private void SetupDataProvider()
+        {
+            this._mockDataProvider = MockComponentProvider.CreateDataProvider();
+            this._mockDataProvider.Setup(x => x.GetListEntriesByListName("ImageTypes", string.Empty, It.IsAny<int>()))
+                .Returns(Mock.Of<IDataReader>());
+        }
+
+        private void SetupCachingProvider()
+        {
+            this._mockCachingProvider = MockComponentProvider.CreateDataCacheProvider();
+            this._mockCachingProvider.Setup(x => x.GetItem(It.IsAny<string>()))
+                .Returns(Enumerable.Empty<ListEntryInfo>());
+        }
+
+        private void SetupServiceProvider()
+        {
+            var serviceCollection = new ServiceCollection();
+            serviceCollection.AddTransient<IApplicationStatusInfo>(
+            container => new Application.ApplicationStatusInfo(Mock.Of<IApplicationInfo>()));
+            serviceCollection.AddTransient(container => Mock.Of<INavigationManager>());
+            serviceCollection.AddTransient(container => Mock.Of<IEventLogger>());
+            Globals.DependencyProvider = serviceCollection.BuildServiceProvider();
+        }
+
+        private void SetupSynchronizationContext()
+        {
+            _synchronizationContext = new TestSynchronizationContext();
+            SynchronizationContext.SetSynchronizationContext(_synchronizationContext);
+            this._testInstance = new FileUploadController();
+        }
+
+        private class TestSynchronizationContext : SynchronizationContext
+        {
+            private bool isUploadFileCalled;
+            public override void Post(SendOrPostCallback d, object state)
+            {
+                d(state);
+            }
+
+            public override void Send(SendOrPostCallback d, object state)
+            {
+                isUploadFileCalled = true;
+            }
+
+            public bool IsUploadFileCalled()
+            {
+                return isUploadFileCalled;
+            }
+        }
+    }
+}