Your Note 8 is equipped with a TF card memory card slot. If your laptop or personal computer has a slot for that kind of card (Most laptop computers are so-equipped), you should be able to transfer music files (The Huawei Note 8 supports these formats: Yes) from your computer to a TF card memory card, and then, from the memory expansion card to your cell phone. Your user manual should explain how to assign the music you just uploaded to your phone's ringer.
The Note 8 is a smartphone. Most smartphones let you store any music file you could find online by touching and holding your finger on it and selecting 'save.' Once a music file is added to your memory card, all you have to do is, again, touch-and-hold it and choose 'assign' from the contextual menu.
The Huawei Note 8 is an Android smartphone and the Android market offers a bunch of free ringtone apps such as MP3 Ringtone Maker, Myxer and more.
Since your Note 8 has a sound recorder (also known as 'voice memo'), a very simple technique involves just putting your phone by your computer's speakers, playing whatever song, music or sound you'd like as a ringtone, and recording it -- you can even use your voice, your child's voice or even your cat's 'meow!' Record it with your mobile and 'voilà!' Unless that function was specifically blocked on the Huawei Note 8, you should be able to navigate to the ringtones sub-menu and assign that recording as a ringtone. Of course, the sound quality won't be perfect but, at least, it's free!
Learn more about making your own free ringtones
Here is a sample of the all free ringtones (compatible with your Huawei Note 8) we offer:
Free 'Unclassified' Ringtones Free Ghost Ringtones Free Short Ringtones Free Far West Ringtones Hear All Our Free Polyphonic Ringtones