If you’re trying to add new records to an existing table, you can export the records as a CSV file and then use the CSV Import app to import the records into your table:
If you’re trying to automate the process of automatically checking your email, then automatically downloading the XLSX attachment, then automatically importing the spreadsheet’s rows into your Airtable table, that can be pretty tricky to setup, but it can be accomplished with Make.com.
If you have a budget for your project and you’d like to hire an expert Airtable consultant and Make Expert to help you create this, please feel free to contact me through my website at scottworld.com.