diff --git a/modules/serviceCenter/services/serviceAgent/coreTools/_connectionTools.py b/modules/serviceCenter/services/serviceAgent/coreTools/_connectionTools.py
index 0f3e4582..06a76d28 100644
--- a/modules/serviceCenter/services/serviceAgent/coreTools/_connectionTools.py
+++ b/modules/serviceCenter/services/serviceAgent/coreTools/_connectionTools.py
@@ -61,13 +61,11 @@ def _registerConnectionTools(registry: ToolRegistry, services):
             )
             adapter = await resolver.resolveService(connectionId, service)
             chatService = services.chat
-            fileContent = chatService.getFileContent(fileId)
-            if not fileContent:
+            fileData = chatService.getFileData(fileId)
+            if not fileData:
                 return ToolResult(toolCallId="", toolName="uploadToExternal", success=False, error="File not found")
-            fileData = fileContent.get("data", b"") if isinstance(fileContent, dict) else b""
-            if isinstance(fileData, str):
-                fileData = fileData.encode("utf-8")
-            fileName = fileContent.get("fileName", "file") if isinstance(fileContent, dict) else "file"
+            fileInfo = chatService.getFileInfo(fileId)
+            fileName = (fileInfo or {}).get("fileName", "file")
             result = await adapter.upload(path, fileData, fileName)
             return ToolResult(toolCallId="", toolName="uploadToExternal", success=True, data=str(result))
         except Exception as e: