Currently, if you are in a Grid Sheet, and use the File path to "Import" via Microsoft Excel, the import creates a new sheet, names is the name of the document you are importing and locates in your personal Sheets workspace. There have been many times I have started a sheet, decided to import Excel data, and then lose the sheet because it did not retain the name I gave it or the location I started in. This is very confusing, and does not match the process of importing into the workspace outside of a sheet.