diff --git a/astrbot/core/agent/runners/base.py b/astrbot/core/agent/runners/base.py
index c53bdc0d..21e79643 100644
--- a/astrbot/core/agent/runners/base.py
+++ b/astrbot/core/agent/runners/base.py
@@ -61,5 +61,5 @@ class BaseAgentRunner(T.Generic[TContext]):
     def _transition_state(self, new_state: AgentState) -> None:
         """Transition the agent state."""
         if self._state != new_state:
-            logger.debug(f"Dify Agent state transition: {self._state} -> {new_state}")
+            logger.debug(f"Agent state transition: {self._state} -> {new_state}")
             self._state = new_state
diff --git a/astrbot/core/utils/dify_api_client.py b/astrbot/core/utils/dify_api_client.py
index 20efdbbd..291699f2 100644
--- a/astrbot/core/utils/dify_api_client.py
+++ b/astrbot/core/utils/dify_api_client.py
@@ -1,4 +1,5 @@
 import codecs
+import io
 import json
 from collections.abc import AsyncGenerator
 from typing import Any
@@ -108,9 +109,10 @@ class DifyAPIClient:
         url = f"{self.api_base}/files/upload"
 
         if file_data is not None:
+            io_data = io.BytesIO(file_data)
             payload = {
                 "user": user,
-                "file": file_data,
+                "file": io_data,
             }
             async with self.session.post(
                 url,