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My current thinking is on how users will upload captions, and I'm leaning toward allowing users to either upload a subtitle file directly (like VTT or SRT), or generating captions using AI. I need to figure out which option is best.\n\n\n**Analyzing AI Integration Options**\n\nI'm now investigating how to handle speech-to-text functionality. I can't find explicit \"speech-to-text\" listed in `llm-calls`, but `websim.chat` might be usable with some clever text manipulation. I'm also considering faking AI captions or defaulting to file uploads. I'm also thinking if window.websim.upload can work with .vtt and .srt formats, which I think it can. I'm also weighing a \"Generate Captions\" button that simulates AI captioning, since the real one seems out of reach.\n\n\n**Focusing on Caption File Upload**\n\nMy priority now is on a reliable caption upload process. Since real audio processing is still unclear, I'm sticking with `.vtt` file uploads. I'll add a file input to `UploadView` for users to submit `.vtt` files. This will populate a `captionFile` state and upload it to a websim blob. Then, I will ensure `room.collection('video').create` includes `captionUrl`. Finally, the `PlayerView` will include a `` element if a `captionUrl` is present.\n\n\n**Integrating Caption URL**\n\nI'm now focusing on integrating the caption URL into the playback. I'll need to check for `video.captionUrl` and conditionally add a `` element to the `