What is updated in win10 Build 14901

In the early morning of this morning, Microsoft pushed the update of win10 Build14901, which is the push of win10 Redstone 2. The following small series will introduce you to the list of win10 Build14901 and Redstone 2 update contents, hoping to help players!
Update:

We know that this year's anniversary version of Build 14393 is internally codenamed "Redstone 1", and Redstone 2 will be the next major feature update for Windows 10.

Build 14901 Update:
- Improve Product Education Tips:
In order to guide our users to get started with Windows 10 as soon as possible, we have introduced a new method, & ldquo; File Explorer” Add a new notification alert feature to give users quick and concise information about their features and new features to try.
Of course, if you don't want to try these notification reminders, you can tick the “Show sync provider notifications> in the options menu of the "File Explorer".

Build 14901 Known Issues:
- Removed support for 1394 kernel debugging, but the next release of the installation package will re-support it. Soon we will announce the workaround in the “Debugging Tools” column on the Windows blog.
- adobe acrobat Reader application will crash at startup
According to Najie, early versions of RS2 focus on OneCore and rewrite, the change of function points will not be too complicated.