diff --git a/hasty/image.py b/hasty/image.py
index 59649fc..e6c1fb5 100644
--- a/hasty/image.py
+++ b/hasty/image.py
@@ -16,7 +16,7 @@
 
 class Image(HastyObject):
     endpoint = '/v1/projects/{project_id}/images'
-    endpoint_uploads = '/v1/projects/{project_id}/image_uploads'
+    endpoint_uploads = '/v1/projects/{project_id}/uploads'
     endpoint_image = '/v1/projects/{project_id}/images/{image_id}'
 
     def __repr__(self):
@@ -133,7 +133,7 @@ def _get_by_id(requester, project_id, image_id):
 
     @staticmethod
     def _generate_sign_url(requester, project_id):
-        data = requester.post(Image.endpoint_uploads.format(project_id=project_id), json_data={"count": 1})
+        data = requester.get(Image.endpoint_uploads.format(project_id=project_id), query_params={"count": 1})
         return data["items"][0]
 
     @staticmethod
@@ -141,7 +141,7 @@ def _upload_from_file(requester, project_id, dataset_id, filepath, external_id:
         filename = os.path.basename(filepath)
         url_data = Image._generate_sign_url(requester, project_id)
         with open(filepath, 'rb') as f:
-            requester.put(url_data['url'], data=f.read(), content_type="image/*")
+            requester.put(url_data['url'], data=f.read(), content_type="")
         res = requester.post(Image.endpoint.format(project_id=project_id),
                              json_data={"dataset_id": dataset_id,
                                         "filename": filename,
@@ -171,7 +171,7 @@ def get_labels(self):
                              obj_params={"project_id": self.project_id})
 
     def create_label(self, label_class: Union[LabelClass, str], bbox: List[int] = None, polygon: List[List[int]] = None,
-                     mask: List[int] = None, z_index: int = None, external_id: Optional[str] = None):
+                     mask: List[int] = None, z_index: int = 0, external_id: Optional[str] = None):
         """
         Create label
 
diff --git a/tests/test_tag.py b/tests/test_tag.py
index 62d9ebc..d337a88 100644
--- a/tests/test_tag.py
+++ b/tests/test_tag.py
@@ -57,14 +57,25 @@ def test_tag(self):
         self.assertEqual(2, len(tags), 'Should be two tag class assigned')
         # Assign same classes
         self.image.add_tags([tc1, tc2])
-        tags = self.image.get_tags()
-        self.assertEqual(2, len(tags), 'Still should be two tag class assigned')
+        original_tags = self.image.get_tags()
+        self.assertEqual(2, len(original_tags), 'Still should be two tag class assigned')
         # Delete one tag
-        self.image.delete_tags([tags[0]])
+        self.image.delete_tags([original_tags[0]])
+        tags = self.image.get_tags()
+        self.assertEqual(1, len(tags), 'Should be one tag class assigned')
+        # Delete another tag by tag_class
+        self.image.delete_tags([tc1, tc2])
+        tags = self.image.get_tags()
+        self.assertEqual(0, len(tags), 'Should not be any tags assigned')
+        # Assign same classes
+        tags = self.image.add_tags([tc1, tc2])
+        self.assertEqual(2, len(tags), 'Should be two tag class assigned')
+        # Delete via object: tag_class_id
+        self.image.delete_tags([{"tag_class_id": tc1.id}])
         tags = self.image.get_tags()
         self.assertEqual(1, len(tags), 'Should be one tag class assigned')
-        # Delete another one tag
-        self.image.delete_tags([{"tag_id": tags[0].id}])
+        # Delete via object: tag_id
+        self.image.delete_tags([{"tag_id": tag.id} for tag in tags])
         tags = self.image.get_tags()
         self.assertEqual(0, len(tags), 'Should not be any tags assigned')