Import Excel With Multiple Tables - Only One Table Imported

I am taking a training class that has us uploading an Excel document with multiple tables into Power BI Service, and the expected outcome is that the Dataset will contain multiple tables. However, it only has a single table from the workbook. The trainer does not know why this is happening, and it's happening for everyone in the class, so presumably there's some issue with the workbook. The workbook contains four sheets, with each sheet containing a separate Table with a unique name.

I've looked at forums and documentation and can't find much about how this feature works (or might not work) in this scenario. Any thoughts?