Change Details

[ENG-9656](https://linear.app/comm/issue/ENG-9656/native-changes-for-minimal-version-of-backup). On backup service, we parse multipart in sequence, so we're going to read `attachments` and as result set `siwe_backup_msg` to None. Alternative is to completely refactor how we parse Multipart on service side - but this is quick and clean, as `attachments` are present only if we have User Data.

[ENG-9656](https://linear.app/comm/issue/ENG-9656/native-changes-for-minimal-version-of-backup). On backup service, we parse multipart in sequence, so we're going to read `attachments` and as a result set `siwe_backup_msg` to None even if this is present. The alternative is to completely refactor how we parse Multipart on the service side - but this is quick and clean, as `attachments` are present only if we have User Data.

[ENG-9656](https://linear.app/comm/issue/ENG-9656/native-changes-for-minimal-version-of-backup). On backup service, we parse multipart in sequence, so we're going to read `attachments` and as a result set `siwe_backup_msg` to None even if this is present. AThe alternative is to completely refactor how we parse Multipart on the service side - but this is quick and clean, as `attachments` are present only if we have User Data.