diff --git a/openpype/client/entity_links.py b/openpype/client/entity_links.py
index e42ac58aff..b74b4ce7f6 100644
--- a/openpype/client/entity_links.py
+++ b/openpype/client/entity_links.py
@@ -164,7 +164,6 @@ def get_linked_representation_id(
         # Recursive graph lookup for inputs
         {"$graphLookup": graph_lookup}
     ]
-
     conn = get_project_connection(project_name)
     result = conn.aggregate(query_pipeline)
     referenced_version_ids = _process_referenced_pipeline_result(
@@ -213,7 +212,7 @@ def _process_referenced_pipeline_result(result, link_type):
 
         for output in sorted(outputs_recursive, key=lambda o: o["depth"]):
             output_links = output.get("data", {}).get("inputLinks")
-            if not output_links:
+            if not output_links and output["type"] != "hero_version":
                 continue
 
             # Leaf
@@ -232,6 +231,9 @@ def _process_referenced_pipeline_result(result, link_type):
 
 
 def _filter_input_links(input_links, link_type, correctly_linked_ids):
+    if not input_links:  # to handle hero versions
+        return
+
     for input_link in input_links:
         if link_type and input_link["type"] != link_type:
             continue
diff --git a/openpype/hosts/blender/plugins/load/import_workfile.py b/openpype/hosts/blender/plugins/load/import_workfile.py
index 618fb83e31..bbdf1c7ea0 100644
--- a/openpype/hosts/blender/plugins/load/import_workfile.py
+++ b/openpype/hosts/blender/plugins/load/import_workfile.py
@@ -44,7 +44,7 @@ class AppendBlendLoader(plugin.AssetLoader):
     """
 
     representations = ["blend"]
-    families = ["*"]
+    families = ["workfile"]
 
     label = "Append Workfile"
     order = 9
@@ -68,7 +68,7 @@ class ImportBlendLoader(plugin.AssetLoader):
     """
 
     representations = ["blend"]
-    families = ["*"]
+    families = ["workfile"]
 
     label = "Import Workfile"
     order = 9
diff --git a/openpype/plugins/load/add_site.py b/openpype/plugins/load/add_site.py
index ac931e41db..e31f746f51 100644
--- a/openpype/plugins/load/add_site.py
+++ b/openpype/plugins/load/add_site.py
@@ -34,12 +34,24 @@ class AddSyncSite(load.LoaderPlugin):
         return self._sync_server
 
     def load(self, context, name=None, namespace=None, data=None):
-        self.log.info("Adding {} to representation: {}".format(
-            data["site_name"], data["_id"]))
-        family = context["representation"]["context"]["family"]
-        project_name = data["project_name"]
-        repre_id = data["_id"]
+        """"Adds site skeleton information on representation_id
+
+        Looks for loaded containers for workfile, adds them site skeleton too
+        (eg. they should be downloaded too).
+        Args:
+            context (dict):
+            name (str):
+            namespace (str):
+            data (dict): expects {"site_name": SITE_NAME_TO_ADD}
+        """
+        # self.log wont propagate
+        project_name = context["project"]["name"]
+        repre_doc = context["representation"]
+        family = repre_doc["context"]["family"]
+        repre_id = repre_doc["_id"]
         site_name = data["site_name"]
+        print("Adding {} to representation: {}".format(
+              data["site_name"], repre_id))
 
         self.sync_server.add_site(project_name, repre_id, site_name,
                                   force=True)
@@ -52,6 +64,8 @@ class AddSyncSite(load.LoaderPlugin):
             )
             for link_repre_id in links:
                 try:
+                    print("Adding {} to linked representation: {}".format(
+                        data["site_name"], link_repre_id))
                     self.sync_server.add_site(project_name, link_repre_id,
                                               site_name,
                                               force=False)
diff --git a/openpype/plugins/load/remove_site.py b/openpype/plugins/load/remove_site.py
index c5f442b2f5..bea8b1b346 100644
--- a/openpype/plugins/load/remove_site.py
+++ b/openpype/plugins/load/remove_site.py
@@ -3,7 +3,10 @@ from openpype.pipeline import load
 
 
 class RemoveSyncSite(load.LoaderPlugin):
-    """Remove sync site and its files on representation"""
+    """Remove sync site and its files on representation.
+
+    Removes files only on local site!
+    """
     representations = ["*"]
     families = ["*"]
 
@@ -24,13 +27,18 @@ class RemoveSyncSite(load.LoaderPlugin):
         return self._sync_server
 
     def load(self, context, name=None, namespace=None, data=None):
-        self.log.info("Removing {} on representation: {}".format(
-            data["site_name"], data["_id"]))
-        self.sync_server.remove_site(data["project_name"],
-                                     data["_id"],
-                                     data["site_name"],
+        project_name = context["project"]["name"]
+        repre_doc = context["representation"]
+        repre_id = repre_doc["_id"]
+        site_name = data["site_name"]
+
+        print("Removing {} on representation: {}".format(site_name, repre_id))
+
+        self.sync_server.remove_site(project_name,
+                                     repre_id,
+                                     site_name,
                                      True)
-        self.log.debug("Site added.")
+        self.log.debug("Site removed.")
 
     def filepath_from_context(self, context):
         """No real file loading"""
diff --git a/openpype/plugins/publish/integrate_hero_version.py b/openpype/plugins/publish/integrate_hero_version.py
index 05d383415b..e796f7b376 100644
--- a/openpype/plugins/publish/integrate_hero_version.py
+++ b/openpype/plugins/publish/integrate_hero_version.py
@@ -386,6 +386,25 @@ class IntegrateHeroVersion(pyblish.api.InstancePlugin):
                     repre["_id"] = old_repre["_id"]
                     update_data = prepare_representation_update_data(
                         old_repre, repre)
+
+                    # Keep previously synchronized sites up-to-date
+                    # by comparing old and new sites and adding old sites
+                    # if missing in new ones
+                    old_repre_files_sites = [
+                        f.get("sites", []) for f in old_repre.get("files", [])
+                    ]
+                    for i, file in enumerate(repre.get("files", [])):
+                        repre_sites_names = {
+                            s["name"] for s in file.get("sites", [])
+                        }
+                        for site in old_repre_files_sites[i]:
+                            if site["name"] not in repre_sites_names:
+                                # Pop the date to tag for sync
+                                site.pop("created_dt", None)
+                                file["sites"].append(site)
+
+                        update_data["files"][i] = file
+
                     op_session.update_entity(
                         project_name,
                         old_repre["type"],
diff --git a/openpype/tools/loader/widgets.py b/openpype/tools/loader/widgets.py
index c0e68fcc7a..0c5c9391cf 100644
--- a/openpype/tools/loader/widgets.py
+++ b/openpype/tools/loader/widgets.py
@@ -1480,23 +1480,21 @@ class RepresentationWidget(QtWidgets.QWidget):
         repre_ids = []
         data_by_repre_id = {}
         selected_side = action_representation.get("selected_side")
+        site_name = "{}_site_name".format(selected_side)
 
         is_sync_loader = tools_lib.is_sync_loader(loader)
         for item in items:
-            item_id = item.get("_id")
-            repre_ids.append(item_id)
+            repre_id = item["_id"]
+            repre_ids.append(repre_id)
             if not is_sync_loader:
                 continue
 
-            site_name = "{}_site_name".format(selected_side)
             data_site_name = item.get(site_name)
             if not data_site_name:
                 continue
 
-            data_by_repre_id[item_id] = {
-                "_id": item_id,
-                "site_name": data_site_name,
-                "project_name": self.dbcon.active_project()
+            data_by_repre_id[repre_id] = {
+                "site_name": data_site_name
             }
 
         repre_contexts = get_repres_contexts(repre_ids, self.dbcon)
@@ -1586,8 +1584,8 @@ def _load_representations_by_loader(loader, repre_contexts,
             version_name = version_doc.get("name")
         try:
             if data_by_repre_id:
-                _id = repre_context["representation"]["_id"]
-                data = data_by_repre_id.get(_id)
+                repre_id = repre_context["representation"]["_id"]
+                data = data_by_repre_id.get(repre_id)
                 options.update(data)
             load_with_repre_context(
                 loader,
diff --git a/openpype/version.py b/openpype/version.py
index 61339fb3dd..8dfd638414 100644
--- a/openpype/version.py
+++ b/openpype/version.py
@@ -1,3 +1,3 @@
 # -*- coding: utf-8 -*-
 """Package declaring Pype version."""
-__version__ = "3.15.1-nightly.4"
+__version__ = "3.15.1-nightly.5"