diff --git a/src/services/task_service.py b/src/services/task_service.py
index c9328b90..de297dff 100644
--- a/src/services/task_service.py
+++ b/src/services/task_service.py
@@ -17,7 +17,9 @@ class TaskService:
     def __init__(self, document_service=None, process_pool=None):
         self.document_service = document_service
         self.process_pool = process_pool
-        self.task_store: dict[str, dict[str, UploadTask]] = {}  # user_id -> {task_id -> UploadTask}
+        self.task_store: dict[
+            str, dict[str, UploadTask]
+        ] = {}  # user_id -> {task_id -> UploadTask}
         self.background_tasks = set()
 
         if self.process_pool is None:
@@ -122,18 +124,27 @@ class TaskService:
 
             # Process files with limited concurrency to avoid overwhelming the system
             max_workers = get_worker_count()
-            semaphore = asyncio.Semaphore(max_workers * 2)  # Allow 2x process pool size for async I/O
+            semaphore = asyncio.Semaphore(
+                max_workers * 2
+            )  # Allow 2x process pool size for async I/O
 
             async def process_with_semaphore(file_path: str):
                 async with semaphore:
-                    await self.document_service.process_single_file_task(upload_task, file_path)
+                    await self.document_service.process_single_file_task(
+                        upload_task, file_path
+                    )
 
-            tasks = [process_with_semaphore(file_path) for file_path in upload_task.file_tasks.keys()]
+            tasks = [
+                process_with_semaphore(file_path)
+                for file_path in upload_task.file_tasks.keys()
+            ]
 
             await asyncio.gather(*tasks, return_exceptions=True)
 
         except Exception as e:
-            logger.error("Background upload processor failed", task_id=task_id, error=str(e))
+            logger.error(
+                "Background upload processor failed", task_id=task_id, error=str(e)
+            )
             import traceback
 
             traceback.print_exc()
@@ -141,7 +152,9 @@ class TaskService:
                 self.task_store[user_id][task_id].status = TaskStatus.FAILED
                 self.task_store[user_id][task_id].updated_at = time.time()
 
-    async def background_custom_processor(self, user_id: str, task_id: str, items: list) -> None:
+    async def background_custom_processor(
+        self, user_id: str, task_id: str, items: list
+    ) -> None:
         """Background task to process items using custom processor"""
         try:
             upload_task = self.task_store[user_id][task_id]
@@ -163,7 +176,9 @@ class TaskService:
                     try:
                         await processor.process_item(upload_task, item, file_task)
                     except Exception as e:
-                        logger.error("Failed to process item", item=str(item), error=str(e))
+                        logger.error(
+                            "Failed to process item", item=str(item), error=str(e)
+                        )
                         import traceback
 
                         traceback.print_exc()
@@ -190,7 +205,9 @@ class TaskService:
                 pass
             raise  # Re-raise to properly handle cancellation
         except Exception as e:
-            logger.error("Background custom processor failed", task_id=task_id, error=str(e))
+            logger.error(
+                "Background custom processor failed", task_id=task_id, error=str(e)
+            )
             import traceback
 
             traceback.print_exc()
@@ -212,7 +229,10 @@ class TaskService:
 
         upload_task = None
         for candidate_user_id in candidate_user_ids:
-            if candidate_user_id in self.task_store and task_id in self.task_store[candidate_user_id]:
+            if (
+                candidate_user_id in self.task_store
+                and task_id in self.task_store[candidate_user_id]
+            ):
                 upload_task = self.task_store[candidate_user_id][task_id]
                 break
 
@@ -271,10 +291,23 @@ class TaskService:
                 if task_id in tasks_by_id:
                     continue
 
-                # Calculate running and pending counts
+                # Calculate running and pending counts and build file statuses
                 running_files_count = 0
                 pending_files_count = 0
-                for file_task in upload_task.file_tasks.values():
+                file_statuses = {}
+
+                for file_path, file_task in upload_task.file_tasks.items():
+                    if file_task.status.value != "completed":
+                        file_statuses[file_path] = {
+                            "status": file_task.status.value,
+                            "result": file_task.result,
+                            "error": file_task.error,
+                            "retry_count": file_task.retry_count,
+                            "created_at": file_task.created_at,
+                            "updated_at": file_task.updated_at,
+                            "duration_seconds": file_task.duration_seconds,
+                        }
+
                     if file_task.status.value == "running":
                         running_files_count += 1
                     elif file_task.status.value == "pending":
@@ -292,6 +325,7 @@ class TaskService:
                     "created_at": upload_task.created_at,
                     "updated_at": upload_task.updated_at,
                     "duration_seconds": upload_task.duration_seconds,
+                    "files": file_statuses,
                 }
 
         # First, add user-owned tasks; then shared anonymous;
@@ -312,7 +346,10 @@ class TaskService:
 
         store_user_id = None
         for candidate_user_id in candidate_user_ids:
-            if candidate_user_id in self.task_store and task_id in self.task_store[candidate_user_id]:
+            if (
+                candidate_user_id in self.task_store
+                and task_id in self.task_store[candidate_user_id]
+            ):
                 store_user_id = candidate_user_id
                 break
 
@@ -326,7 +363,10 @@ class TaskService:
             return False
 
         # Cancel the background task to stop scheduling new work
-        if hasattr(upload_task, "background_task") and not upload_task.background_task.done():
+        if (
+            hasattr(upload_task, "background_task")
+            and not upload_task.background_task.done()
+        ):
             upload_task.background_task.cancel()
 
         # Mark task as failed (cancelled)