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How to change the notification ringtone for oppor7?

Hello, how to set the ringtone of SIM card of dual-card mobile phone: Open Settings-Voice-Calling Ringtone-Select from File-Select your favorite ringtone, and the option of setting SIM card 1 and SIM card 2 or both will pop up, so that different ringtones can be set for two SIM cards. The system ringtone can only be set for two cards at the same time, and there is no option to set it separately. If you have any other questions, you can enter the OPPO enterprise platform to ask the customer service!