How do I use the app signing function newly released on the Google Play?

In normal cases, you are not advised to enable the app signing function independently. When performing operations, select OPT-OUT. Other operations do not change.

The enabling of the app signing function incurs the following problems:

1. The original Google Play signature becomes invalid, which affects the configured map key. You need to use the development account to obtain the SHA1 value under the app signing function and re-configure a map key.

2. If Facebook or Twitter login is configured, you also need to re-configure a key.