Replace /file/d/ with /uc?id= and chop all after the next slash. Paste the result into a blank tab–if the photo appears by itself, you’ve scored a naked endpoint that bypasses the viewer wrapper and serves the binary straight from the big G’s CDN.
Program the Reel to recycle every three days with a new caption pull pulled from the latest comment ("@lucy_won iPhone 15 – your turn?"). Instagram treats it as fresh media, twice the eyeballs without extra filming.
At T+11 min trigger an IG Story sticker poll ("This or That?") linking back to the original post
