It would seem a simple matter to save an Excel spreadsheet as a web page (html) to upload to Website Builder. When you save a spreadsheet, you have to make three decisions:

  1. where to save it ("Save in:")
  2. what to name it ("File name:")
  3. what format to save it in ("Save as type:").

Where the confusions comes is when you select "Web page" as the file type, most will miss the next step (it's very easy to miss). When you select "Web page" as the file type, you then have to tell Excel whether you are saving the "Entire Workbook" or the "Selection: Sheet." You must save only the Sheet; not the Workbook.