Include the document as subtitles in the in-app videoplayer

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Start by locating the in-app videoplayer and the document or transcription entry points. Determine how subtitles should be represented and displayed in the player, then define the expected behavior for documents without subtitle content. Done means the document appears as subtitles in the in-app videoplayer and the behavior is covered by appropriate checks.

Written by the indexing model from the issue text.