You need to use the third-party software "Ringtone Duoduo" to set it up. Taking Iphone XS MAX as an example, the steps to set ringtones are as follows:

1. Open the mobile software download center, search for Ringtone Duoduo app, click to download and install.

2. After the download is completed, click to open the Ringtone Duoduo app to enter the Ringtone Duoduo homepage, and use the search function to find the ringtone you want to make.

3. After the search is completed, the selection interface will pop up, select the ringtone you want to set and click, select the set ringtone button below the ringtone.

4. After clicking the "Settings" button, the steps for setting ringtones will pop up. Select the Cool Band app, click and enter.

5. After entering the Cool Band page, click on the audio you just downloaded to Cool Band, long press the audio to pop up more function options, and click the *Share button.

6. After entering the *** sharing page, select and click the ringtone button in the middle of the screen.

7. The ringtone export function page will pop up, click to select the export ringtone function.

8. After the export is successful, find the ringtone you want to set in the phone ringtone setting interface, click to select and the setting will be successful.