How to add Excel spreadsheet

I have an existing app that is using Google Sheets. I now want to add an Excel Sheet where I am keeping student grades and have that work with the data in my Google Sheets. I connected my Microsoft Excel account, but I don’t know what to do from here.

i haven’t tried but i think you go to data and press + to add a date source then excel. you need a team plan though

That worked. Thank you!