Update of Static Files Not Working - Nginx

I have Django app and Nginx serving static files. I’ve transferred a static file to my server on droplet and restarted Nginx. I also restarted Gunicorn. I even rebooted my server – and I cannot seem to update the static file on the production-side. It works on my development server just fine. I’ve run python manage.py collectstatic and python manage.py runserver. Still no update of static file. It’s a .png file. Any ideas would be much appreciated.