App update issue from google play

Dear Thunkable X,
I made an app using thunkable X which i already uploaded on the google play store.I made a few changes and i want to update it there , but google play wants me to sign it. What i am asking is if you can tell me how to sign it.

I was able to deal with this problem.

@Balanced_Kitchen Thanks for posting!!

Can you share with everyone what the problem was? This may be helpful to others that experience a similar issue.