export app android and ios

i bought flutter app for salon from codecanyon, i need this app coming alive, i have files, what i need you to do export the apk and ipa no more from ready source code, i will share all file for the chosen one
i will choose the price on average
here the link of the app :
https://codecanyon.net/item/gofresha-nearby-salon-spa-barber-appointment-flutter-app-backend-included/34116985