diff --git a/api/core/helper/credential_utils.py b/api/core/helper/credential_utils.py
index c608fb0290..edaae2c7b9 100644
--- a/api/core/helper/credential_utils.py
+++ b/api/core/helper/credential_utils.py
@@ -2,7 +2,7 @@
 Credential utility functions for checking credential existence and policy compliance.
 """
 
-from dify.api.configs import dify_config
+from configs import dify_config
 from services.enterprise.plugin_manager_service import PluginCredentialType
 
 
diff --git a/api/dify_graph/nodes/llm/node.py b/api/dify_graph/nodes/llm/node.py
index a5492aee6b..9025efc583 100644
--- a/api/dify_graph/nodes/llm/node.py
+++ b/api/dify_graph/nodes/llm/node.py
@@ -16,7 +16,7 @@ from core.llm_generator.output_parser.structured_output import invoke_llm_with_s
 from core.model_manager import ModelInstance
 from core.prompt.entities.advanced_prompt_entities import CompletionModelPromptTemplate, MemoryConfig
 from core.prompt.utils.prompt_message_util import PromptMessageUtil
-from core.tools.signature import sign_upload_file
+from core.tools.signature import sign_upload_file_preview_url
 from dify_graph.constants import SYSTEM_VARIABLE_NODE_ID
 from dify_graph.entities import GraphInitParams
 from dify_graph.entities.graph_config import NodeConfigDict
@@ -712,7 +712,7 @@ class LLMNode(Node[LLMNodeData]):
                                         related_id=upload_file.id,
                                         size=upload_file.size,
                                         storage_key=upload_file.key,
-                                        url=sign_upload_file(upload_file.id, upload_file.extension),
+                                        url=sign_upload_file_preview_url(upload_file.id, upload_file.extension),
                                     )
                                     context_files.append(attachment_info)
                 yield RunRetrieverResourceEvent(