cant get srcset after addmedia (for json response)

[mrpotensial]

I want to return the data along with the responsive image immediately after saving it to the db
but function getSrcset() return empty data

$album->addMedia($file)->withResponsiveImages()->toMediaCollection('images');

return $album;

produces an empty array for "responsive_image":

{
  "name": "3",
  "file_name": "3.jpg",
  "disk": "public",
  "conversions_disk": "public",
  "collection_name": "images",
  "mime_type": "image/jpeg",
  "size": 673465,
  "custom_properties": [],
  "generated_conversions": [],
  "responsive_images": [],
  "manipulations": [],
  "model_id": "9a8b88d4-9c66-451e-a83d-57d4b52e0ea8",
  "model_type": "App\\Models\\Album",
  "uuid": "34ccdafc-8984-4b58-8cfc-b76cbab3430e",
  "order_column": 2,
  "updated_at": "2023-11-07T00:27:13.000000Z",
  "created_at": "2023-11-07T00:27:13.000000Z",
  "id": 29,
  "original_url": "http://mywebsite/album/images/34ccdafc-8984-4b58-8cfc-b76cbab3430e/3.jpg",
  "preview_url": ""
} 

but if I use the $album->getFirstMedia('images') function, "responsive_images" column has srcset data, getSrcset() functions normally and gives the srcset data that I want.

am I doing it wrong? or we have to do another query to get the responsive image then return it.