How to make in-app update feature work for apple business manager app (private/custom app) made with flutter?

Question

My app is a custom/private apple business manager app

What I Tried:

1. I tried the upgrader package for flutter. It doesn't work on IOS (with android it works fine). My implementation: `body: UpgradeAlert( upgrader: Upgrader( debugLogging: true, countryCode: "in",

    ),
    child: Column(
      children: [])........`
   

2. Thought of using only remote config of firebase but it isn't reliable as app store updates comes nearly after 1-2 days to existing users.

Is there anything that i Missed?