Mobile Field Forms PDF Generator

I need a cross-platform mobile application (iOS and Android) that lets my team complete three existing field forms on-site, have room to expand into other forms, stores every submission on our own servers, and instantly turns each form into a polished, client-ready PDF... (Budget: $1500 - $3000 CAD, Jobs: Agile Development, Android, Database Management, Documentation, Flutter, HTML, iOS, Mobile App Development, PHP, React Native)