Save a document or workbook to Tasklist

When you are ready to save a document, press the Save to Tasklist button in the ribbon bar or the backstage menu.  This will bring up a menu:

If you press the Save button, Tasklist will check whether the document is already saved to the app.  If it is, the app will just save your changes.  If it is not yet in the app, the app will prompt you to save a new document.

If you press Save as a new document, the app will prompt you to save the document as a new document, even if it is already in the app.

If you press Save as a new version of this document, the app will save the document as a new version of the same document.  This allows you to preserve the prior version of the document.

If you press Save as a new version of another document, the app will prompt you to select a document, and it will save the open document as a new version of the document you select.