How to set the alarm sound on Apple mobile phone?

Search for AISI Assistant with computer Baidu, download and install it, open the PC side of AISI Assistant, connect the mobile device to the computer, click the download button on the right side of the ringtone in the "Cool ringtone" resource, download the ringtone and import it into the mobile device.

Or you can do it yourself. Use the PC side of AISI Assistant to make and import ringtones (ringtone making tutorial). Open the PC of AISI Assistant, connect the mobile device to the computer, click Toolbox-ringtone making, click "ringtone making" in the pop-up window, select the ringtone, and click "Import to device" to wait for the import to be completed.

You can choose the local file you want here! After that, you can choose on your mobile phone.