I believe I have properly edited the settings under Content->Design->Configuration for my sites robots.txt but when I try to pull the url I'm getting a blank file.
Search Engine Robots:
I don't know if could be related but in previous versions of Magento 2 there was an issue the the robots.txt file and the location (I don't remember all the issues).
Can you share a public URL of your store?
Is the robots.txt file placed at the magento root directory or into path/to/magento/pub ?