Microsoft is rolling out Windows 10 Build 17758 for Insiders in the Fast Ring. Windows 10 Build 17758 doesn't come with any major changes as the focus is now entirely on refining performance ahead of the public launch of the Windows 10 October 2018 Update next month.
This build comes with improvements for Storage Sense. According to the changelog, the Storage Sense is getting a new feature that would automatically free up disk space by making older and unused local files available online-only. Microsoft is using OneDrive to keep your files safe and represented as placeholders on your Windows 10 devices.
"We call this process “dehydration”. Your online-only files will still be visible on your device. When connected to the internet, you’ll be able to use online-only files just like any other file," writes Microsoft's Aniket Naravanekar in a blog post. You can open Settings -> System -> Storage and enable the dehydration feature.
There are several other general improvements, refinements, and as well as known issues that you can check below:
This build comes with only one known issue, which is expected to be fixed before public release of October 2018 Update.
As always, you can open the Settings app and navigate to Windows Update to download the latest preview build.
Windows 10 October 2018 Update is still in preview but it's projected to be finalized in mid-September and the public rollout would begin in early October. You can learn more about the update and features here.