Get a local copy of a file from django storages S3

script.py

from django.core.files import File
from django.core.files.storage import default_storage, FileSystemStorage
from django.conf import settings
from django.core.files.base import ContentFile
local_storage = FileSystemStorage()
local_storage.base_location = settings.MEDIA_ROOT


def get_local_file_from_object(obj):
    """
        obj.binary = FileField()
    """
    if default_storage.__class__ == 'your.settings.backend.cloud.Class':
        # If we are using cloud storage we have to retrieve the file locally if doesn't exists...
        filename = 'tmp/'+obj.binary.name
        # If the file is not on local storage download it...
        if not local_storage.exists(filename):
            local_storage.save(filename, ContentFile(obj.binary.read()))
        # if exist retrieve the abs path
        local_file_path = local_storage.path(filename)
    else:
        # If storage is not cloud retrieve the path from the local storage
        local_file_path = obj.binary.path
    return File(open(local_file_path, 'rb'))