Even if your app only uses HTTPS (this is 99% of all apps), you still need to file a French encryption declaration.

Under French law (Article L2332-1 of the Defense Code) and ANSSI guidance (source), any cryptographic functionality, including HTTPS, requires at least a simple declaration.

Apple also highlights the need to comply with local encryption regulations even for standard libraries (Apple docs).

There are services like NovaStore that can handle the filing if you want to stay compliant.