To keep track of your Watch Documentary Movies and TV Shows progress, use the Discovery+ app. 2. You can also share your discoveries with friends using the social media buttons on the app's main screen. 3. The Discovery+ app will let you view all of your watched documentaries, as well as browse for new shows to watch. 4. Finally, make sure to regularly check back on the app's updates page to see what new movies and TV shows have been added!