Restoring Deleted Files or Folders from SharePoint or Teams
This Solution Article will show how to restore files or folders that have been accidentally or prematurely deleted in a Team or SharePoint.
If you wish to watch a short 1:09 video from Microsoft click this Link.
1. Go the SharePoint site that the files or folders were deleted from. ( This can be done through Teams in the team Files tab where you deleted the item and at the top bar there will be Open in SharePoint)
2. In the Navigation Pane to the left select Recycle Bin. ( If you do not see Recycle Bin please see step 3 but continue to step 4 if you do)
3. If Recycle bin does not display in the Navigation Pane, Click the Setting icon at the top right, and then click Site contents.
Then Recycle bin will be over to the right of the screen under the settings icon.
4. On the Recycle bin page, click the Box next to the files that you want to restore which will then select them, then click the Restore button at the top.
Referenced from: Support.office.com