diff --git a/client/ayon_slack/plugins/publish/integrate_slack_api.py b/client/ayon_slack/plugins/publish/integrate_slack_api.py
index 4ef0b45..57c8c0e 100644
--- a/client/ayon_slack/plugins/publish/integrate_slack_api.py
+++ b/client/ayon_slack/plugins/publish/integrate_slack_api.py
@@ -362,7 +362,7 @@ def _upload_attachments(self, publish_files):
             with open(published_file, "rb") as f:
                 uploaded_file = self.client.files_upload_v2(
                     filename=os.path.basename(published_file),
-                    file=f.read()
+                    file=f
                 )
                 file_urls.append(uploaded_file.get("file").get("permalink"))