Click the "..." button next to the file in Teams and click "Open In Sharepoint"

In the browser window that opens click the "..." button next to the file and click Version History

This will open a list of the saved versions of this file, browse through the versions of the file until you find the one with a date prior to the data being deleted and click the date to open the file.

If you are prompted to log in, do so.

If the missing data is there, close the file and go back to the Version History screen.

Click the arrow next to the file you want to restore and click Restore to restore this version of the file.