The Select Tables screen will only show files that match the Data Source type (Excel, text, Access, etc). Double-check to make sure that the selected Data Source type is the actual type of data in the file in question. For example, a common mistake would be selecting Excel (.xls, .xlsx, .xlsb) as the Data Source, however the actual type of data in the file is a Text (.csv)
I can’t find my excel files:
There are three types of Excel files (XLS, XLSX, XLSB). The selected Data Source type must match the file type exactly for the files to display in the Select Tables screen.