In your settings:

WEBDAV_STORAGE_LOCATION = 'http://my-web-storage.com/upload/'

In your models:

class Attachement(models.Model):

object = models.ForeignKey(Object) content = WebDAVFileField(upload_to='storage', null=True)

class Photo(models.Model):

user = models.ForeignKey(User) content = WebDAVImageField(upload_to='photos')