diff --git a/server/mergin/sync/models.py b/server/mergin/sync/models.py
index 6527213c..84dbe890 100644
--- a/server/mergin/sync/models.py
+++ b/server/mergin/sync/models.py
@@ -725,10 +725,14 @@ def diffs_chain(
         )
         # file never existed prior that version
         if not latest_change:
+            logging.warning(f"File {file_id} never existed prior version {version}")
             return None, []
 
         # the last update to file was a delete
         if latest_change.change == PushChangeType.DELETE.value:
+            logging.warning(
+                f"File {file_id} latest change prior version {version} was delete"
+            )
             return None, []
 
         # the last update to file was a create / force update
@@ -736,10 +740,14 @@ def diffs_chain(
             PushChangeType.CREATE.value,
             PushChangeType.UPDATE.value,
         ):
+            logging.warning(
+                f"File {file_id} latest change prior version {version} was {latest_change.change}"
+            )
             return latest_change, []
 
         basefile = cls.get_basefile(file_id, version)
         if not basefile:
+            logging.warning(f"File {file_id} has no basefile prior version {version}")
             return None, []
 
         diffs = []
@@ -782,9 +790,16 @@ def diffs_chain(
                     .order_by(FileDiff.version)
                     .all()
                 )
+                logging.info(
+                    f"File {file_id} checkpoint {item.end} of rank {item.rank} missing, "
+                    f"replacing with {len(individual_diffs)} diffs"
+                )
                 diffs.extend(individual_diffs)
             else:
                 # we asked for individual diff but there is no such diff as there was not change at that version
+                logging.warning(
+                    f"File {file_id} checkpoint {item.end} of rank {item.rank} missing as there was no data change"
+                )
                 continue
 
         return basefile, diffs
diff --git a/server/mergin/sync/public_api_controller.py b/server/mergin/sync/public_api_controller.py
index 0cbd5e90..d36fd183 100644
--- a/server/mergin/sync/public_api_controller.py
+++ b/server/mergin/sync/public_api_controller.py
@@ -337,12 +337,17 @@ def download_project_file(
     else:
         file_path = fh.location
 
+    abs_path = os.path.join(project.storage.project_dir, file_path)
+
     if version and not diff:
+        logging.info(f"Restoring {namespace}/{project_name}/{file} at {version}")
         project.storage.restore_versioned_file(
             file, ProjectVersion.from_v_name(version)
         )
+        if not os.path.exists(abs_path):
+            logging.error(f"Could not restore {namespace}/{project_name}/{file_path}")
+            abort(404)
 
-    abs_path = os.path.join(project.storage.project_dir, file_path)
     # check file exists (e.g. there might have been issue with restore)
     if not os.path.exists(abs_path):
         logging.error(f"Missing file {namespace}/{project_name}/{file_path}")
diff --git a/server/mergin/sync/storages/disk.py b/server/mergin/sync/storages/disk.py
index 02c0c8ed..b3a66ba0 100644
--- a/server/mergin/sync/storages/disk.py
+++ b/server/mergin/sync/storages/disk.py
@@ -375,6 +375,7 @@ def restore_versioned_file(self, file: str, version: int):
         )
 
         if not is_versioned_file(file):
+            logging.warning(f"File {file} is not gpkg file")
             return
 
         # if project version is not found, return it
@@ -382,15 +383,20 @@ def restore_versioned_file(self, file: str, version: int):
             project_id=self.project.id, name=version
         ).first()
         if not project_version:
+            logging.warning(f"Project version {version} for file {file} not found")
             return
 
         # check actual file from the version files
         file_found = next((i for i in project_version.files if i.path == file), None)
 
-        # check the location that we found on the file
-        if not file_found or os.path.exists(
-            os.path.join(self.project_dir, file_found.location)
-        ):
+        # check the file is found in files at particular version
+        if not file_found:
+            logging.warning(f"File {file} not found in version {version}")
+            return
+
+        # check if file already exists
+        if os.path.exists(os.path.join(self.project_dir, file_found.location)):
+            logging.info(f"File {file} already exists at {version}")
             return
 
         file_id = (
@@ -401,6 +407,9 @@ def restore_versioned_file(self, file: str, version: int):
 
         base_meta, diffs = FileHistory.diffs_chain(file_id, version)
         if not (base_meta and diffs):
+            logging.warning(
+                f"File {file} at version {version} does not have basefile or there are no diffs"
+            )
             return
 
         start = time.time()