nice one, Vin!

Thanks this saved me!
The magic lines that helped me:

mysite/settings.py

MEDIA_ROOT = os.environ["RAILWAY_VOLUME_MOUNT_PATH"]

mysite/urls.py

urlpatterns += [ re_path(r'^media/(?P<path>.*)$', serve, {'document_root': settings.MEDIA_ROOT})]

Glad it worked out for ya!