code: @Action
      @ActionLayout(
              named = "Import"
      )
      @MemberOrder(name="toDoItems", sequence="2")
      public List<ExcelModuleDemoToDoItemBulkUpdateLineItem> importBlob(
              @Parameter(fileAccept = ".xlsx")
              @ParameterLayout(named="Excel spreadsheet")
              final Blob spreadsheet) {
          final List<ExcelModuleDemoToDoItemBulkUpdateLineItem> lineItems =
                  excelService.fromExcel(spreadsheet, WORKSHEET_SPEC);
          container.informUser(lineItems.size() + " items imported");
          return lineItems;
      }
docs: region > import (action)