How to set the ringtone of Apple 4 SMS longer?

I was stumped by this at first, hehe, you have to download itunes first, then open iTunes, and select files in the menu bar-add files to the library.

Select the song you want to ring, and then click Open.

This song will appear in the "Music Library"

Right-click the song and choose Show Info.

Select the option and fill in the start time and stop time (within 40 seconds). -"Okay"

Right-click the song again and select Create ACC Version.

A file with the same file name but less than 40 seconds will appear.

Right-click the newly created song, select "Display in windows Explorer", change the format of "m4a" to "m4r", and select "Yes" in the pop-up window.

Ps: If m4a is not visible, after selecting Display in windows Explorer, select Folder Options in the tools in the menu bar, and select View. In the advanced settings, uncheck the box in front of hiding the extension of known files, and then click OK.

Check: In the itunes menu bar "Edit", find "Preferences" to open it.

Check "Ringtone" in "Common"-"Source", and then check "OK"

You can see the "ringtone" in the "database"

Turn on the "ringtone" and you can see if your file has been turned into a ringtone.

Then open "iphone" in Devices.

Select Ringtones, check the item "Synchronize Ringtones", select "All Ringtones" or "Selected Ringtones" and then select "Synchronize".

After successfully synchronizing the "ringtone"

Ringtone will appear in Settings-Sound-Ringtone-Customize.

To use this ringtone, simply select. "Custom" option

Above the Standard option.