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Your Xiaomi Mi5X is equipped with a TF card memory card slot. If your laptop or personal computer is compatible with that kind of card (Most laptop computers are so-equipped), you should be able to transfer music files
The Xiaomi Mi 5X is an Android smartphone and the Android market offers a bunch of free ringtone apps such as MP3 Ringtone Maker, Myxer and more.
Learn more about making your own free ringtones
Here is a sample of the all free ringtones (compatible with your Xiaomi Mi 5X) we offer:
Free 'Unclassified' Ringtones Free Ghost Ringtones Free Short Ringtones Free Techno Ringtones Hear All Our Free Polyphonic Ringtones