Insert one sync marker on a clip's transcript.
Use this when:
- The user is explicit about WHERE the camera should pause / cut (e.g. "sync the word 'submit' to 4.2s of the demo").
- `auto_sync` ran but missed a step you care about.
How matching works:
- `word`: case-insensitive, punctuation-stripped. The first match in the transcript is used unless `occurrence > 1`.
- `occurrence`: 1-indexed — pass 2 to target the SECOND time that word appears, 3 for the third, etc. Required when the word repeats.
- `timestamp_seconds`: clip-relative seconds. When the clip has run TTS already (`generated_timestamps` present), the server inverse-maps this to original-recording seconds automatically.
Constraints: the clip MUST be a video clip with a source recording (otherwise the frame thumbnail can't be extracted). The transcript must already contain the word — if not, you'll get `word_not_found` with a 200-char excerpt of the transcript to help you retry.
ConnectorNo auth