This setup is working for me, maybe it will help you. It is for latest version of Django. Many answers in OS are for older Django versions.
URLS:
from django.conf.urls.static import static
from django.conf import settings
urlpatterns = [
#url
]+ static(settings.MEDIA_URL, document_root=settings.MEDIA_ROOT)
Settings:
MEDIA_ROOT = os.path.join(BASE_DIR, 'media')
MEDIA_URL = '/media/'
Template:
<img src="{{ foo.image.url }}"><br>
Model:
image = models.ImageField(upload_to = 'img/', default = 'img/None/no-img.jpg')
My foo model has an imagefield, when it is stored, I can retrieve the full url through item.image.url based on the above setup.