AWS provide aws-sdk for react-native but I’m not sure how to use it.
May be try this package https://www.npmjs.com/package/react-native-aws3
and use this config

const config = {
  keyPrefix: 'some-path/',
  bucket: 'spaces-name',
  region: 'sgp1', // you can look at spaces endpoint ex. subdomain.sgp1.digitaloceanspaces.com
  accessKey: KEY,
  secretKey: SECRET_KEY,
  successActionStatus: 201,
  awsUrl: 'sgp1.digitaloceanspaces.com',
}