diff --git a/backend/app/api/routes.py b/backend/app/api/routes.py
index 62b6954..c2528a0 100644
--- a/backend/app/api/routes.py
+++ b/backend/app/api/routes.py
@@ -51,6 +51,9 @@ class CelestialBodyUpdate(BaseModel):
     is_active: Optional[bool] = None
     extra_data: Optional[Dict[str, Any]] = None
 
+class ResourceUpdate(BaseModel):
+    extra_data: Optional[Dict[str, Any]] = None
+
 
 @router.post("/", status_code=status.HTTP_201_CREATED)
 async def create_celestial_body(
@@ -782,13 +785,17 @@ async def get_static_data(
 
 @router.post("/resources/upload")
 async def upload_resource(
-    body_id: Optional[str] = None,
+    body_id: str = Query(..., description="Celestial body ID"),
     resource_type: str = Query(..., description="Type: texture, model, icon, thumbnail, data"),
     file: UploadFile = File(...),
     db: AsyncSession = Depends(get_db)
 ):
     """
     Upload a resource file (texture, model, icon, etc.)
+
+    Upload directory logic:
+    - Probes (type='probe'): upload to 'model' directory
+    - Others (planet, satellite, etc.): upload to 'texture' directory
     """
     import os
     import aiofiles
@@ -802,15 +809,37 @@ async def upload_resource(
             detail=f"Invalid resource_type. Must be one of: {valid_types}"
         )
 
+    # Get celestial body to determine upload directory
+    body = await celestial_body_service.get_body_by_id(body_id, db)
+    if not body:
+        raise HTTPException(status_code=404, detail=f"Celestial body {body_id} not found")
+
+    # Determine upload directory based on body type
+    # Probes -> model directory, Others -> texture directory
+    if body.type == 'probe' and resource_type in ['model', 'texture']:
+        upload_subdir = 'model'
+    elif resource_type in ['model', 'texture']:
+        upload_subdir = 'texture'
+    else:
+        # For icon, thumbnail, data, use resource_type as directory
+        upload_subdir = resource_type
+
     # Create upload directory structure
-    upload_dir = Path("upload") / resource_type
+    upload_dir = Path("upload") / upload_subdir
     upload_dir.mkdir(parents=True, exist_ok=True)
 
-    # Generate unique filename
-    import uuid
-    file_ext = os.path.splitext(file.filename)[1]
-    unique_filename = f"{uuid.uuid4()}{file_ext}"
-    file_path = upload_dir / unique_filename
+    # Use original filename
+    original_filename = file.filename
+    file_path = upload_dir / original_filename
+
+    # If file already exists, append timestamp to make it unique
+    if file_path.exists():
+        from datetime import datetime
+        name_without_ext = os.path.splitext(original_filename)[0]
+        file_ext = os.path.splitext(original_filename)[1]
+        timestamp = datetime.now().strftime("%Y%m%d_%H%M%S")
+        original_filename = f"{name_without_ext}_{timestamp}{file_ext}"
+        file_path = upload_dir / original_filename
 
     # Save file
     try:
@@ -821,29 +850,42 @@ async def upload_resource(
         # Get file size
         file_size = os.path.getsize(file_path)
 
+        # Store relative path (from upload directory)
+        relative_path = f"{upload_subdir}/{original_filename}"
+
+        # Determine MIME type
+        mime_type = file.content_type
+
         # Create resource record
         resource = await resource_service.create_resource(
             {
                 "body_id": body_id,
                 "resource_type": resource_type,
-                "file_path": str(file_path),
+                "file_path": relative_path,
                 "file_size": file_size,
-                "mime_type": file.content_type,
+                "mime_type": mime_type,
             },
             db
         )
 
-        logger.info(f"Uploaded resource: {file_path} ({file_size} bytes)")
+        # Commit the transaction
+        await db.commit()
+        await db.refresh(resource)
+
+        logger.info(f"Uploaded resource for {body.name} ({body.type}): {relative_path} ({file_size} bytes)")
 
         return {
             "id": resource.id,
             "resource_type": resource.resource_type,
             "file_path": resource.file_path,
             "file_size": resource.file_size,
-            "message": "File uploaded successfully"
+            "upload_directory": upload_subdir,
+            "message": f"File uploaded successfully to {upload_subdir} directory"
         }
 
     except Exception as e:
+        # Rollback transaction
+        await db.rollback()
         # Clean up file if database operation fails
         if file_path.exists():
             os.remove(file_path)
@@ -871,6 +913,7 @@ async def get_body_resources(
             "file_size": resource.file_size,
             "mime_type": resource.mime_type,
             "created_at": resource.created_at.isoformat(),
+            "extra_data": resource.extra_data,
         })
 
     return {"body_id": body_id, "resources": result}
@@ -914,6 +957,47 @@ async def delete_resource(
         raise HTTPException(status_code=500, detail="Failed to delete resource")
 
 
+@router.put("/resources/{resource_id}")
+async def update_resource(
+    resource_id: int,
+    update_data: ResourceUpdate,
+    db: AsyncSession = Depends(get_db)
+):
+    """
+    Update resource metadata (e.g., scale parameter for models)
+    """
+    from sqlalchemy import select, update
+
+    # Get resource record
+    result = await db.execute(
+        select(Resource).where(Resource.id == resource_id)
+    )
+    resource = result.scalar_one_or_none()
+
+    if not resource:
+        raise HTTPException(status_code=404, detail="Resource not found")
+
+    # Update extra_data
+    await db.execute(
+        update(Resource)
+        .where(Resource.id == resource_id)
+        .values(extra_data=update_data.extra_data)
+    )
+    await db.commit()
+
+    # Get updated resource
+    result = await db.execute(
+        select(Resource).where(Resource.id == resource_id)
+    )
+    updated_resource = result.scalar_one_or_none()
+
+    return {
+        "id": updated_resource.id,
+        "extra_data": updated_resource.extra_data,
+        "message": "Resource updated successfully"
+    }
+
+
 
 # ============================================================
 # Orbit Management APIs
diff --git a/backend/app/models/celestial.py b/backend/app/models/celestial.py
index 9b80d91..e6ca46c 100644
--- a/backend/app/models/celestial.py
+++ b/backend/app/models/celestial.py
@@ -21,7 +21,7 @@ class CelestialBody(BaseModel):
     id: str = Field(..., description="JPL Horizons ID")
     name: str = Field(..., description="Display name")
     name_zh: str | None = Field(None, description="Chinese name")
-    type: Literal["planet", "probe", "star", "dwarf_planet", "satellite"] = Field(..., description="Body type")
+    type: Literal["planet", "probe", "star", "dwarf_planet", "satellite", "comet"] = Field(..., description="Body type")
     positions: list[Position] = Field(
         default_factory=list, description="Position history"
     )
@@ -43,7 +43,7 @@ class BodyInfo(BaseModel):
 
     id: str
     name: str
-    type: Literal["planet", "probe", "star", "dwarf_planet", "satellite"]
+    type: Literal["planet", "probe", "star", "dwarf_planet", "satellite", "comet"]
     description: str
     launch_date: str | None = None
     status: str | None = None
diff --git a/backend/upload/model/hubble_space_telescope.glb b/backend/upload/model/hubble_space_telescope.glb
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index 8ce60c6..0000000
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