@emptywheel When you add France to the list of countries to distribute an app to in app stores, you are asked if you are importing cryptography into France, and you need to upload your declaration.
So yes, for Signal, we did add the list of algorithms that we used (the app is open-source) and answered the questions on key storage and other topics that are in the declaration form.
Export compliance documentation for encryption - Reference - App Store Connect - Help - Apple Developer
Depending on the kind of encryption algorithm your app uses, you may need to provide documentation in App Store Connect.
(developer.apple.com)