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SMB Service 4.15.9 requires DSM 7.1.1 or above.
Important Notes

Please note that currently the SMB3 Multichannel function only supports x86 platforms. For models in x86 platforms, please refer to all models listed in this article.
You cannot downgrade to a previous version once you have installed SMB Service 4.15.9.
If you have installed Synology Directory Server, it will be automatically updated to version 4.15.9 when you update SMB Service to version 4.15.9. You cannot downgrade Synology Directory Server to a previous version once it has been updated.
The update is expected to be available in all regions and models within the next few days. The actual time of release may vary slightly depending on the region and model.
What's New

Updated Samba to version 4.15.9.
Added the SMB3 Multichannel function. This function allows users to take full advantage of the network bandwidth by using multiple connections between the client and server, providing increased throughput and network fault tolerance. Please note that currently the SMB3 Multichannel function only supports x86 platforms. You can enable this function at Control Panel > File Services > SMB > Advanced Settings > Others.
Fixed Issues

Fixed an issue where Spotlight search on macOS 13 could not function properly.
Minor bug fixes.