Usage of OpenAi Storage user_data for API

Hi,
I am trying to process a large number of images with the batching api. I am aware of adding images as base64 or providing a url. Is it also possible to utilize the storage-section to upload an image and use maybe the fileId? Or to build a url out of it and use that? Or do i need to setup a blobstore to be able to provide the images?

Thanks for your help :slight_smile: