Put function of Blob store on server fails (in preview environment)

[gabcodearmada]

I get FetchError: request to http://0.0.0.0:8787/image_name.png failed, reason: connect ECONNREFUSED 0.0.0.0:8787

import { put } from '@vercel/blob';

export const POST = async ({ request }) => {
  try {
     const formData = await request.formData();
     const imageFile = formData.get('file') as File;
     const blob = await put(imageFile.name, imageFile.stream(), {
        access: 'public',
        token: "vercel_blob_rw_........yY"
      });

Any ideas?