How to import your Excel(.xlsx) file into a table.
In page edit mode, create Excel-like tables macro (type /ex)
Select the "FILE" tab
Select the "Import" tab
Select the "Excel File" tab
Push the "Import Excel File" button then, select your xlsx file on a dialog
After loading it, the imported Excel file will appear
Save it via the "Save" button, then exit via the "Exit to Confluence" button