For sharing documents to groups, please do the following:

1. Select the document from 'My folders' and click on the "Share" link present in the toolbar menu.
2. A dialog box with heading "Share Document" appears on the screen.
3. Click the 'Group Share' tab and select the group to share your document.
4. Specify the access permission (Viewer or Collaborator) for the shared document & click on the "Share" button.
5. An email with the subject "Document Shared to You on Zoho Docs" will be sent to each member in the group.