Saving is not downloading the film
My List stores the production you chose so you can find it again. A list backup moves that selection and episode notes between browsers. Neither contains the video, subtitles or a playable offline copy.
For travel or unreliable connections
Look for an offline download feature in the service delivering the movie. Availability depends on its title, plan, device and current terms. Complete and test the download before leaving a reliable connection, and check any expiry shown by the app.
Keep the production clear
If you choose a download after browsing here, match the title and year. For a show, confirm the season and episode. An offline copy of the wrong version is not useful when you later have no connection to correct the choice.