I'm re taking some old app that has been in the Play Store for more than 5 years. However now that all my code is migrated to AST, everything is working and I'm ready to make a new update, I've come to realize that the key for signing the app has a diferent extension name. Now Android Studio ask for a file .jks but my old app used to use a .key file. I haven't find anything online.
The same file will work for Android Studio