I'm receiving daily .xlsx files sent to my Gmail account via attachments and I'm trying to use apps script to parse the file into text so I can reformat it and eventually upload arrays to BigQuery. I've seen some questions similar that convert the Excel files to Google Sheets and I am NOT trying to do that. I simply want to be able to see the text in apps script similar to a parsing CSV file.
I tried parsing like a CSV and found that the text was completely random.