Importing Excel Workbook from Sharepoint into PowerBI online

Hi All,

So I spent a few hours trying to import an excel workbook that is located on a Sharepoint site. I go to

"Get Data>Files>Sharepoint Team Sites".

I then paste the URL into the box but the only URL that works is www.[myname].sharepoint.com/sites/[sitename] and then I go into the folder and select the Excel File but out of around 10 worksheet tabs, only 2 load under the "Fields" section. However, when I "connected" it rather than importing it to see if the whole workbook would show on Excel Online, it worked. The entire workbook loaded onto Excel Online. 

My question is, why do only 2 worksheets load when i import the entire Workbook?

Any help would be appreciated!

Regards,

Sara