尝试dify读取图片！

plugins/dify/main.py

@@ -395,12 +395,13 @@ class DifyPlugin(MessagePluginInterface):
                     form.add_field("file", f, filename=os.path.basename(file_path))
                     form.add_field("user", user_id)
                     response = await session.post(url, headers=headers, data=form, proxy=proxy, timeout=40)
-                    if response.status != 200:
+                    if response.status not in (200, 201):
                         error_text = await response.text()
                         self.LOG.error(f"Dify上传失败: {response.status} {error_text}")
                         return None
 
                     resp_data = await response.json()
+                    self.LOG.debug(f"Dify上传成功: status={response.status}, keys={list(resp_data.keys())}")
 
             if isinstance(resp_data, dict):
                 if resp_data.get("id"):