I have existing SharePoint sites that I would like to bring into Teams. Can I do that?

Yes – you can connect your existing SharePoint team sites and content to your teams in Microsoft Teams! And when we say sites and content, it’s the full power of SharePoint — the same powerful content management experience of working with sites and the content within the context of Teams. Soon, you will be able to create a Team for your Office 365 group-connected SharePoint team site. With one click on the new “Create a Team” button (will appear on the bottom-left corner of your site), you can “Teamify” your SharePoint site.

Today, you can do the following:

1. Add SharePoint document libraries as tabs in Teams
2. Add SharePoint lists and pages as tabs in Teams
3. Use the SharePoint News connector to have team news flow directly from SharePoint and into the Teams Conversation tab.
4. Add full sites (team sites and communication sites) as tabs in Teams via the Website tab

• Learn how to create a Teams instance for a SharePoint group-connected team site
• Learn more about how SharePoint + Teams powers teamwork in Office 365
• Check out our top 10 most important powers of SharePoint
• Stay up to date with our Office 365 public roadmap

Ref Document: MST2190