How do I debug react native app with function names and line number in logs?

Hi,

I have a expo managed workflow react native app and after building IOS and submitting to the app store to test in testflight the app crashes at the splash screen.

I have log files that contain just the hexadecimal numbers.

I cant seem to find information in google on how to get the symbols into the log files
or how to build with symbols so I can see the function names and line numbers in the last exception
backtrace.

I have read I need dSym files is that right?

Could you plz lead to information on how to debug a Expo SDK 47, EAS 3.7.2 app?

Malcolm