Adding Content to private Marketplace from Company GitHub repository

All, Is it possible to maintain company reusable modules/packages in company GitHub repo and upload to private marketplace by using Select from GitHub option as show in the below picture?  I tried uploading a mpk file from my campany repo as instructed below url, like created a repo, created a release and selected a mpk from a release but when I click save, it showing invalid GitHub details error message.  
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