问题
Alright so this is the error I get when uploading the APK to Google Developer Console;
Upload failed
You uploaded an APK that is signed with a different certificate to your previous APKs. You must use the same certificate.
Your existing APKs are signed with the certificate(s) with fingerprint(s): [ SHA1: Numbers go here ] and the certificate(s) used to sign the APK you uploaded have fingerprint(s): [ SHA1: different numbers go here ]
However, I know for a fact I'm using the same .keystore I used last night when I initially uploaded the application. So I don't understand why It let me publish my game, but now it won't update it.
I have no idea at all how to use the Google App Signing feature, and please do not link me to the URL released by Google because I've read it and do not understand it at all.
I have the upload_cert.der but I do not know how to sign my game with the new certification. Please explain Step by step if possible, how to do this.
As you can tell I am totally lost and will not grasp how to complete my task if you just start throwing out command lines. For one, Where in the heck do I type these command lines? Yes I am aware in CMD, but What file location? I've been trying really hard to figure this out on my own but every link I've gone to either was unanswered or gave a answer that was way more complicated than just telling them how to do it, and resulting in still not knowing how to do it.
So please, if you can explain to me how in the world to do this app signing thing I'd greatly appreciate it. I'm using Unity3D for my App signing.
来源：https://stackoverflow.com/questions/45001557/google-play-app-signing-cant-upload-update