diff --git a/src/Umbraco.Core/Packaging/PackageDefinition.cs b/src/Umbraco.Core/Packaging/PackageDefinition.cs
index 345d669b15..ae12a914b3 100644
--- a/src/Umbraco.Core/Packaging/PackageDefinition.cs
+++ b/src/Umbraco.Core/Packaging/PackageDefinition.cs
@@ -28,7 +28,7 @@ namespace Umbraco.Cms.Core.Packaging
         public string Name { get; set; } = string.Empty;
 
         /// <summary>
-        /// The full path to the package's xml file
+        /// The full path to the package's XML file.
         /// </summary>
         [ReadOnly(true)]
         [DataMember(Name = "packagePath")]
@@ -71,12 +71,9 @@ namespace Umbraco.Cms.Core.Packaging
         public IList<string> DataTypes { get; set; } = new List<string>();
 
         [DataMember(Name = "mediaUdis")]
-        public IList<GuidUdi> MediaUdis { get; set; } = Array.Empty<GuidUdi>();
+        public IList<GuidUdi> MediaUdis { get; set; } = new List<GuidUdi>();
 
         [DataMember(Name = "mediaLoadChildNodes")]
         public bool MediaLoadChildNodes { get; set; }
-
-
     }
-
 }
diff --git a/src/Umbraco.Infrastructure/Packaging/PackageInstallation.cs b/src/Umbraco.Infrastructure/Packaging/PackageInstallation.cs
index 5138a4c630..e09bdf3e18 100644
--- a/src/Umbraco.Infrastructure/Packaging/PackageInstallation.cs
+++ b/src/Umbraco.Infrastructure/Packaging/PackageInstallation.cs
@@ -44,20 +44,29 @@ namespace Umbraco.Cms.Infrastructure.Packaging
             //make sure the definition is up to date with everything
             foreach (var x in installationSummary.DataTypesInstalled)
                 packageDefinition.DataTypes.Add(x.Id.ToInvariantString());
+
             foreach (var x in installationSummary.LanguagesInstalled)
                 packageDefinition.Languages.Add(x.Id.ToInvariantString());
+
             foreach (var x in installationSummary.DictionaryItemsInstalled)
                 packageDefinition.DictionaryItems.Add(x.Id.ToInvariantString());
+
             foreach (var x in installationSummary.MacrosInstalled)
                 packageDefinition.Macros.Add(x.Id.ToInvariantString());
+
             foreach (var x in installationSummary.TemplatesInstalled)
                 packageDefinition.Templates.Add(x.Id.ToInvariantString());
+
             foreach (var x in installationSummary.DocumentTypesInstalled)
                 packageDefinition.DocumentTypes.Add(x.Id.ToInvariantString());
-            foreach (var x in installationSummary.StylesheetsInstalled)
-                packageDefinition.Stylesheets.Add(x.Id.ToInvariantString());
-            var contentInstalled = installationSummary.ContentInstalled.ToList();
-            packageDefinition.ContentNodeId = contentInstalled.Count > 0 ? contentInstalled[0].Id.ToInvariantString() : null;
+
+            foreach (var x in installationSummary.MediaTypesInstalled)
+                packageDefinition.MediaTypes.Add(x.Id.ToInvariantString());
+
+            packageDefinition.ContentNodeId = installationSummary.ContentInstalled.FirstOrDefault()?.Id.ToInvariantString();
+            
+            foreach (var x in installationSummary.MediaInstalled)
+                packageDefinition.MediaUdis.Add(x.GetUdi());
 
             return installationSummary;
         }