# For the developer: linking app and server data

Article: Data in AppMetrica: overview

If some actions are confirmed on the server, the developer links them to the same user in the app. This is needed to see their actions together.

To upload an event via the Post API, the corresponding identifier must have been previously transferred via the SDK. Before setup, check the supported data types and [upload restrictions](https://appmetrica.yandex.ru/docs/en/mobile-api/post/restrictions).