Apps uploaded to App Store Connect are uploaded to an Apple server in the United States. When you submit your app with the intention of distributing your app on the App Store or to external testers through TestFlight outside of the U.S. or Canada, it is considered a U.S. export and is subject to U.S. export laws (regardless of where your legal entity is based). If your app uses, accesses, contains, implements, or incorporates encryption, this is considered an export of encryption software, and is therefore subject to U.S. export and other country import compliance requirements.
See Export compliance documentation for encryption in App Store Connect Help to understand which documentation might be required for your app. See Provide export compliance documentation to learn how to submit the needed information in App Store Connect.