diff --git a/Lombiq.EmailClient.Tests.UI/Extensions/UITestContextExtensions.cs b/Lombiq.EmailClient.Tests.UI/Extensions/UITestContextExtensions.cs
index e1b06bc..287fa31 100644
--- a/Lombiq.EmailClient.Tests.UI/Extensions/UITestContextExtensions.cs
+++ b/Lombiq.EmailClient.Tests.UI/Extensions/UITestContextExtensions.cs
@@ -17,6 +17,13 @@ public static Task ExecuteEmailClientSampleRecipeDirectlyAsync(this UITestContex
     public static Task InitSampleEmailsAsync(this UITestContext context)
     {
         var basePath = Path.Combine(AppContext.BaseDirectory, "TestEmails");
+
+        // If not found, use the NuGet contentFiles path.
+        if (!Directory.Exists(basePath))
+        {
+            basePath = Path.Combine(AppContext.BaseDirectory, "contentFiles", "any", "net8.0", "TestEmails");
+        }
+
         return context.CreateAndUseLocalSmtpClientToSendEmailsFromFilesAsync([
             Path.Combine(basePath, "sample_important_1.eml"),
             Path.Combine(basePath, "sample_important_2.eml"),
diff --git a/Lombiq.EmailClient.Tests.UI/Lombiq.EmailClient.Tests.UI.csproj b/Lombiq.EmailClient.Tests.UI/Lombiq.EmailClient.Tests.UI.csproj
index aab167d..9652fed 100644
--- a/Lombiq.EmailClient.Tests.UI/Lombiq.EmailClient.Tests.UI.csproj
+++ b/Lombiq.EmailClient.Tests.UI/Lombiq.EmailClient.Tests.UI.csproj
@@ -34,7 +34,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <Content Include="TestEmails\*.eml" CopyToOutputDirectory="PreserveNewest" Pack="true" PackagePath="TestEmails" />
+    <Content Include="TestEmails\*.eml" Pack="true" PackagePath="contentFiles/any/net8.0/TestEmails" />
   </ItemGroup>
 
 </Project>