Do I need to submit caption files for English titles? Filmhub November 15, 2017 03:37 Updated Follow Yes. Closed captions are mandatory for most streaming services these days. Please refer to subtitles vs. closed captions. Related articles Subtitles vs. closed captions Can you recommend a company that does captioning service? What caption file formats do you accept? Revenue sharing with collaborators Making changes after a title is submitted Comments 0 comments Please sign in to leave a comment.