Update app.py

app.py

@@ -1050,8 +1050,10 @@ async def chunked_upload(upload_url: str, file: UploadFile, content_type: str, c
     return True
 
 async def get_file_size(file: UploadFile) -> int:
-    await file.seek(0, 2)
-    size = file.tell()
+    await file.seek(0)
+    size = 0
+    while chunk := await file.read(8192):
+        size += len(chunk)
     await file.seek(0)
     return size