Hello, I can build a fully responsive React Native multilingual Android and IOS app similar to the existing app with Expo managed workflow and the app will download files form Firebase storage as per your requirements. I am senior Android and IOS app developer and I am absolutely sure that I can do the project very well. Share the existing app details.
Lets have a quick chat to discuss further.
I have extensive experience in designing and development of Websites, Mobile Applications, Management Systems and E-commerce or Online Stores Solutions.
Kindly have a look at my Portfolio and Client's reviews via this link,
https://www.freelancer.com/u/junkyfunky
Thanks,
Faizan A.