I thought I'd try uploading a caption file to Squarespace's CDN and then use a code block with and tags to create a player (thusly: -US/docs/Web/Guide/Audio_and_video_delivery/Adding_captions_and_subtitles_to_HTML5_video) but before I go about reinventing the wheel ... does anyone have experience with adding subtitles/captions to an uploaded (not embedded) video in Squarespace?