diff --git a/dotnet/tests/Microsoft.Agents.AI.Workflows.Declarative.IntegrationTests/MediaInputTest.cs b/dotnet/tests/Microsoft.Agents.AI.Workflows.Declarative.IntegrationTests/MediaInputTest.cs
index 5400628ba3..da30db6f98 100644
--- a/dotnet/tests/Microsoft.Agents.AI.Workflows.Declarative.IntegrationTests/MediaInputTest.cs
+++ b/dotnet/tests/Microsoft.Agents.AI.Workflows.Declarative.IntegrationTests/MediaInputTest.cs
@@ -2,7 +2,6 @@
 
 using System;
 using System.IO;
-using System.Net.Http;
 using System.Threading.Tasks;
 using Azure.AI.Projects;
 using Azure.Identity;
@@ -21,12 +20,13 @@ public sealed class MediaInputTest(ITestOutputHelper output) : IntegrationTest(o
 {
     private const string WorkflowWithConversationFileName = "MediaInputConversation.yaml";
     private const string WorkflowWithAutoSendFileName = "MediaInputAutoSend.yaml";
-    private const string ImageReference = "https://sample-files.com/downloads/images/jpg/web_optimized_1200x800_97kb.jpg";
-    private const string PdfReference = "https://sample-files.com/downloads/documents/pdf/basic-text.pdf";
+    private const string ImageReferenceUrl = "https://sample-files.com/downloads/images/jpg/web_optimized_1200x800_97kb.jpg";
+    private const string PdfLocalFile = "TestFiles/basic-text.pdf";
+    private const string ImageLocalFile = "TestFiles/test-image.jpg";
 
     [Theory]
-    [InlineData(ImageReference, "image/jpeg", true)]
-    [InlineData(ImageReference, "image/jpeg", false)]
+    [InlineData(ImageReferenceUrl, "image/jpeg", true)]
+    [InlineData(ImageReferenceUrl, "image/jpeg", false)]
     public async Task ValidateFileUrlAsync(string fileSource, string mediaType, bool useConversation)
     {
         // Arrange
@@ -39,12 +39,12 @@ public async Task ValidateFileUrlAsync(string fileSource, string mediaType, bool
     // Temporarily disabled
     [Theory]
     [Trait("Category", "IntegrationDisabled")]
-    [InlineData(ImageReference, "image/jpeg", true)]
-    [InlineData(ImageReference, "image/jpeg", false)]
+    [InlineData(ImageLocalFile, "image/jpeg", true)]
+    [InlineData(ImageLocalFile, "image/jpeg", false)]
     public async Task ValidateImageFileDataAsync(string fileSource, string mediaType, bool useConversation)
     {
         // Arrange
-        byte[] fileData = await DownloadFileAsync(fileSource);
+        byte[] fileData = ReadLocalFile(fileSource);
         string encodedData = Convert.ToBase64String(fileData);
         string fileUrl = $"data:{mediaType};base64,{encodedData}";
         this.Output.WriteLine($"Content: {fileUrl.Substring(0, Math.Min(112, fileUrl.Length))}...");
@@ -54,12 +54,12 @@ public async Task ValidateImageFileDataAsync(string fileSource, string mediaType
     }
 
     [Theory]
-    [InlineData(PdfReference, "application/pdf", true)]
-    [InlineData(PdfReference, "application/pdf", false)]
+    [InlineData(PdfLocalFile, "application/pdf", true)]
+    [InlineData(PdfLocalFile, "application/pdf", false)]
     public async Task ValidateFileDataAsync(string fileSource, string mediaType, bool useConversation)
     {
         // Arrange
-        byte[] fileData = await DownloadFileAsync(fileSource);
+        byte[] fileData = ReadLocalFile(fileSource);
         string encodedData = Convert.ToBase64String(fileData);
         string fileUrl = $"data:{mediaType};base64,{encodedData}";
         this.Output.WriteLine($"Content: {fileUrl.Substring(0, Math.Min(112, fileUrl.Length))}...");
@@ -71,12 +71,12 @@ public async Task ValidateFileDataAsync(string fileSource, string mediaType, boo
     // Temporarily disabled
     [Theory]
     [Trait("Category", "IntegrationDisabled")]
-    [InlineData(PdfReference, "doc.pdf", true)]
-    [InlineData(PdfReference, "doc.pdf", false)]
+    [InlineData(PdfLocalFile, "doc.pdf", true)]
+    [InlineData(PdfLocalFile, "doc.pdf", false)]
     public async Task ValidateFileUploadAsync(string fileSource, string documentName, bool useConversation)
     {
         // Arrange
-        byte[] fileData = await DownloadFileAsync(fileSource);
+        byte[] fileData = ReadLocalFile(fileSource);
         AIProjectClient client = new(this.TestEndpoint, new AzureCliCredential());
         using MemoryStream contentStream = new(fileData);
         OpenAIFileClient fileClient = client.GetProjectOpenAIClient().GetOpenAIFileClient();
@@ -94,11 +94,10 @@ public async Task ValidateFileUploadAsync(string fileSource, string documentName
         }
     }
 
-    private static async Task<byte[]> DownloadFileAsync(string uri)
+    private static byte[] ReadLocalFile(string relativePath)
     {
-        using HttpClient client = new();
-        client.DefaultRequestHeaders.UserAgent.ParseAdd("Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/110.0");
-        return await client.GetByteArrayAsync(new Uri(uri));
+        string fullPath = Path.Combine(AppContext.BaseDirectory, relativePath);
+        return File.ReadAllBytes(fullPath);
     }
 
     private async Task ValidateFileAsync(AIContent fileContent, bool useConversation)
diff --git a/dotnet/tests/Microsoft.Agents.AI.Workflows.Declarative.IntegrationTests/Microsoft.Agents.AI.Workflows.Declarative.IntegrationTests.csproj b/dotnet/tests/Microsoft.Agents.AI.Workflows.Declarative.IntegrationTests/Microsoft.Agents.AI.Workflows.Declarative.IntegrationTests.csproj
index 985086a56e..309a590b83 100644
--- a/dotnet/tests/Microsoft.Agents.AI.Workflows.Declarative.IntegrationTests/Microsoft.Agents.AI.Workflows.Declarative.IntegrationTests.csproj
+++ b/dotnet/tests/Microsoft.Agents.AI.Workflows.Declarative.IntegrationTests/Microsoft.Agents.AI.Workflows.Declarative.IntegrationTests.csproj
@@ -36,6 +36,9 @@
     <None Update="Workflows\*.yaml">
       <CopyToOutputDirectory>Always</CopyToOutputDirectory>
     </None>
+    <None Update="TestFiles\*">
+      <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+    </None>
   </ItemGroup>
 
 </Project>
diff --git a/dotnet/tests/Microsoft.Agents.AI.Workflows.Declarative.IntegrationTests/TestFiles/basic-text.pdf b/dotnet/tests/Microsoft.Agents.AI.Workflows.Declarative.IntegrationTests/TestFiles/basic-text.pdf
new file mode 100644
index 0000000000..a4fb8a4509
Binary files /dev/null and b/dotnet/tests/Microsoft.Agents.AI.Workflows.Declarative.IntegrationTests/TestFiles/basic-text.pdf differ
diff --git a/dotnet/tests/Microsoft.Agents.AI.Workflows.Declarative.IntegrationTests/TestFiles/test-image.jpg b/dotnet/tests/Microsoft.Agents.AI.Workflows.Declarative.IntegrationTests/TestFiles/test-image.jpg
new file mode 100644
index 0000000000..8bb5fc31c4
Binary files /dev/null and b/dotnet/tests/Microsoft.Agents.AI.Workflows.Declarative.IntegrationTests/TestFiles/test-image.jpg differ