How to transfer the key?

Question

Android

Hello! I created a project in android studio and generated an apk file. How do I transfer the project correctly, or more precisely, how do I transfer the certificate correctly?
On other computers, when creating a certificate, I specify all the same fields, but Google play writes when updating the version, they say, "certificates are not identical, use one." And the most annoying thing is that I did not generate a certificate at home, but in general with a friend. So now I have to go to him to release a new version.

Answer 1

When generating a certificate, you specified its directory. When signing, by the way, they must also indicate. Find this file and copy it. By default, certificates are located in c:\Users\UserName\.android\

Answer 2

Specifically, this certificate file must be the one you signed with