Is there a way to use credentials within the preview browser?

I am trying to create documentation/issues within my private GitHub repository. I am inline linking (img tags) to screen shot images that exist in my repo and was hoping to preview them. I have seen the actions that use credentials to add issues and have used that successfully (I can see the credential in preferences) but not sure how to use them for the preview. Any tricks or tips?

Credentials are usually for things like direct API access. If you want to pull into the preview then I think you’ll need public image URLs.

If you want private URLs from Github, I think your best (but not necessarily only) bet would be to upload into Github (e.g. a beta site if necessary) and preview in a full Safari session.

I kinda figured and makes sense. Thank you as always for the assistance!