Oppo How to Change Ringtone

How can we change the ringtone on the Oppo smartphone? there is a simple option in the settings where we can choose from standard ringtones. on dual SIM devices, the ringtone can be set separately for each SIM card, and it is also possible to use a separate ringtone.

Oppo's ColorOS operating system allows us to set our own ringtone for calls and messages in addition to the standard ringtones, and in the case of dual SIM devices, our own ringtone can be set for the SIM card in question.

It doesn't matter in which folder the own ringtone is stored, the function automatically searches the whole memory for supported file formats like MP3.