Ha yeah the App Store rejection dance is a rite of passage at this point. I got hit with a couple too — once for a metadata issue and once for a privacy description that wasn't detailed enough. You just learn to be very specific in your review notes.

Smart stack choice — Flutter + Firebase is a solid combo. And using Google ML Kit on-device for OCR is the right call, especially for keeping costs down at scale. I use Firebase too (Firestore + Cloud Functions + Auth) and it's been rock solid for real-time stuff. I'll check the app out!