In addition to the default ringtone for calls, the LG smartphone allows you to assign an individual ringtone to each contact, which can be used in addition to the standard ringtones, and can be saved as an mp3 file in the Ringtones folder.

Android 9 | LG UX 9.0
Step 1:  Open the  Contacts -App
Step 2:  Tap on desired  Contact
Step 3:  Tap on  Edit
Step 4:  Tap on  More
Step 5:  Tap on  Ringtone
Step 6:  Tap on  Main
Step 7:  Choose desired  Ringtone
Step 8:  Tap on  OK
Step 9:  Tap on  Save
  1. Open the Contacts-App
  2. Tap on desired Contact
  3. Tap on Edit
  4. Tap on More
  5. Tap on Ringtone
  6. Tap on Main
  7. Choose desired Ringtone
  8. Tap on OK
  9. Tap on Save

LG Instructions