https://wccftech.com/windows-10-october-2018-update-new-build/

Microsoft has released a fresh new Preview Build to the Fast ring Insiders. As expected, the latest Windows 10 October 2018 Update preview doesn’t bring any new changes as the focus remains on performance improvement and stability. Here are the complete details of Windows 10 Insider Preview Build 17758 (Redstone 5 aka the October 2018 Update).

Starting with Windows 10, Storage Sense has embarked on a path to keep your storage optimized. We’re making continuous improvements in every feature update. From Build 17720 and later, we’re adding a new capability and making a few changes to Storage Sense’s behavior. Storage Sense now has the capability to automatically free up disk space by making older, unused, locally available files be available online-only. Learn more in the Storage Sense blog post here.