How do I add captions/subtitles to AI-generated product videos for Amazon?

Amazon does not auto-generate captions, but 85% of mobile shoppers watch videos on mute, so captions are critical. Two approaches: 1) Burned-in captions (hardcoded into video frames) - use AutoAGC's 'Caption Overlay' feature after video generation, paste your script, choose a subtitle style (white text + black outline + bottom-center position is most readable), and the AI syncs caption timing to the voiceover. 2) Closed captions (uploadable SRT file) - Amazon's video player does not currently support SRT for seller-uploaded videos, so burned-in captions are the only option. Caption length limit: max 30 characters per line, max 2 lines per screen, display duration minimum 1.5 seconds. AutoAGC auto-segments your script into compliant caption chunks - no manual timing needed.