The "COPY TRACKING URL" is simple the tracking URL of your offer. This redirects to only the Offer destination URL and in case the offer is paused or caps reached, it redirects to the Exit URL.
The "AUTO TS-URL" is the automated created link of the offer which can be used as a smartlink. This link is found below the regular tracking URL (COPY TRACKING-URL) and also under the "Smart Links" tab. To unlock this URL in the Smartlinks tab click on 'Advanced Mode'. The COPY AUTO-TS URL can be customized as a "weighted" or "targeted" smart link, to perform A/B testing or other offers could be connected with it and be used as a fallback in case the the original offer does not redirect to the destination URL. Click here to learn more about Smartlinks.