Why can't Android 9 use modifiers?

There is a compatibility problem in the mobile phone system.

There is something wrong with the third-party application downloaded and installed on the mobile phone, which can't be used normally. The following methods are recommended: close and restart the application. It is recommended to uninstall and reinstall the software. Try a different version. After the mobile phone system version is updated, install and try to back up the mobile phone data (phone book, SMS, multimedia files, etc.). ), restore the factory settings and then try to install. If it still doesn't work after returning to the factory, other third-party software can work normally, and only this software can't work normally. This is the compatibility problem of the mobile phone system.