diff --git a/Facepunch.Steamworks/Interfaces/Workshop.Editor.cs b/Facepunch.Steamworks/Interfaces/Workshop.Editor.cs
index 761cb64..e57d2fa 100644
--- a/Facepunch.Steamworks/Interfaces/Workshop.Editor.cs
+++ b/Facepunch.Steamworks/Interfaces/Workshop.Editor.cs
@@ -24,6 +24,7 @@ public class Editor
             public ItemType? Type { get; set; }
             public string Error { get; internal set; } = null;
             public string ChangeNote { get; set; } = "";
+            public uint WorkshopUploadAppId { get; set; }
 
             public enum VisibilityType : int
             {
@@ -109,7 +110,7 @@ private void StartCreatingItem()
                 if ( !Type.HasValue )
                     throw new System.Exception( "Editor.Type must be set when creating a new item!" );
 
-                CreateItem = workshop.ugc.CreateItem( workshop.steamworks.AppId, (SteamNative.WorkshopFileType)(uint)Type, OnItemCreated );
+                CreateItem = workshop.ugc.CreateItem( WorkshopUploadAppId, (SteamNative.WorkshopFileType)(uint)Type, OnItemCreated );
             }
 
             private void OnItemCreated( SteamNative.CreateItemResult_t obj, bool Failed )
@@ -130,7 +131,7 @@ private void OnItemCreated( SteamNative.CreateItemResult_t obj, bool Failed )
 
             private void PublishChanges()
             {
-                UpdateHandle = workshop.ugc.StartItemUpdate( workshop.steamworks.AppId, Id );
+                UpdateHandle = workshop.ugc.StartItemUpdate(WorkshopUploadAppId, Id );
 
                 if ( Title != null )
                     workshop.ugc.SetItemTitle( UpdateHandle, Title );
diff --git a/Facepunch.Steamworks/Interfaces/Workshop.cs b/Facepunch.Steamworks/Interfaces/Workshop.cs
index e35bc4b..c32713a 100644
--- a/Facepunch.Steamworks/Interfaces/Workshop.cs
+++ b/Facepunch.Steamworks/Interfaces/Workshop.cs
@@ -98,9 +98,20 @@ public Query CreateQuery()
         /// </summary>
         public Editor CreateItem( ItemType type )
         {
-            return new Editor() { workshop = this, Type = type };
+        	return CreateItem(this.steamworks.AppId, type);
         }
-
+        
+        /// <summary>
+        /// Create a new Editor object with the intention of creating a new item.
+        /// Your item won't actually be created until you call Publish() on the object.
+        /// Your item will be published to the provided appId.
+        /// </summary>
+        /// <remarks>You need to add app publish permissions for cross app uploading to work.</remarks> 
+        public Editor CreateItem( uint workshopUploadAppId, ItemType type )
+        {
+        	return new Editor() { workshop = this, WorkshopUploadAppId = workshopUploadAppId, Type = type };
+        }
+        
         /// <summary>
         /// Returns a class representing this ItemId. We don't query
         /// item name, description etc. We don't verify that item exists.