In order to share a page from the Content Library with your logo on it, you can do one of two things:
Pull the Content Page into a Lookbook, hide the Cover Page, and share the Lookbook link.
Duplicate the Content Page from the Content Library by clicking the three dots on the page and selecting Duplicate. You can add a tag for your company name if you like, on the duplicated version.
Then click the three dots next to the duplicated version of the page and select Share from the dropdown there.
Have fun creating beautiful content 🙌