Importing from Excel not working

Hello, I am trying to import an excel spreadsheet as a new board and it is taking a very long time. After waiting hours for my spreadsheet with 5 text columns and 50 rows, I simplified it to 3 rows and 3 columns as a test and it is still not able to create a board - it is stuck on “preparing data…”. The same issue is happening with importing from Google Sheets. Is there anything I can do to speed up the process?

Thank you in advance!