title: How to use Django FileField with dynamic Amazon S3 bucket?
body: <p>I have a Django model with a Filefield, and a default storage using Amazon S3 bucket (via the excellent <a href="http://django-storages.readthedocs.io/" rel="nofollow noreferrer">django-storage</a>).</p>
  
  <p>My problem is not to upload files to a dynamic folder path (as we see in many other answers). My problem is deeper and twofold:</p>
  
  <ul>
  <li>Files are already inside an Amazon S3 bucket, and I do not want to download-reupload them (worse: I have only a read-access to them).</li>
  <li>Files are accessible through S3 credentials that could be different from one file to another (that is, files can be located inside different buckets, and access through different credentials). Hence, <strong>my FileField must have a dynamic storage</strong>.</li>
  </ul>
  
  <p>Any idea?</p>
  
  <p>(Djabgo 1.11, Python 3).</p>