MMS - saving picture impossible - Phone S7 - SM-G930F - Android 7.1.2

I can receive MMS including displayed pictures. Yet when I save them, without any error message, they are eventually just not present in Gallery. All of Chronology, Albums and videos are empty “Aucune photo, resp vidéo, trouvée” My provider is Free.

There are some open issues with MMS on different devices on Gitlab. You can check the issue and add your comments with logs or create a new issue.