I'm recently planning to upgrade my iPhone from an 8 plus to a 14 plus. There is an app, Shadowrocket, I purchased an vpn service, along with an bought version of Shadowrocket from others, so I have to download the app under another Apple ID. The country I'm in, the app store does not have the app.
That is not downloaded under my personal Apple ID, I'm concerned about whether, as the title says, the app can be transferred to an new iPhone.
ps. the 8 plus is on iOS 15.7.1.