Gmail now automatically uses your web signature on Android if you haven’t set a mobile-specific one. The Android feature is ...

please quit and restart the application and re-open the file. Update the placeholder copy with your information. When you're finished, copy and paste into your email program's "Signatures" preference.

If you don’t have a mobile-specific signature in Gmail for Android or iOS, Google will now use your web signature. The Gmail mobile apps have long let you set a signature that’s specific to ...